Isaac Newton Conceived of His Most Groundbreaking Ideas During the Great Plague of 1665

Whether you’ve vol­un­teered to self-quar­an­tine, or have done so from neces­si­ty, health experts world­wide say home is the best place to be right now to reduce the spread of COVID-19. For some this means lay­offs, or remote assign­ments, or an anx­ious and indef­i­nite stay­ca­tion. For oth­ers it means a loss of safe­ty or resources. No mat­ter how much choice we had in the mat­ter, there are those among us who har­bor ambi­tious fan­tasies of using the time to final­ly fin­ish labors of love, whether they be cro­chet, com­pos­ing sym­phonies, or writ­ing a con­tem­po­rary nov­el about a plague.

Many life­sav­ing dis­cov­er­ies have been made in the wake of epi­demics, and many a nov­el writ­ten, such as Albert Camus’ The Plague, com­posed three years after an out­break of bubon­ic plague in Alge­ria. Offer­ing even more of a chal­lenge to house­bound writ­ers is the exam­ple of Shake­speare, who wrote some of his best works dur­ing out­breaks of plague in Lon­don, when “the­aters were like­ly closed more often than they were open,” as Daniel Pol­lack-Pelzn­er writes at The Atlantic, and when it was alleged that “the cause of plagues are plays.”

You can for­give your­self for tak­ing a few days to orga­nize your clos­ets, or—let’s be real—binge on snacks and Net­flix series. But if you’re still look­ing for a role mod­el of pro­duc­tiv­i­ty in a time of quar­an­tine, you couldn’t aim high­er than Isaac New­ton. Dur­ing the years 1665–67, the time of the Great Plague of Lon­don, Newton’s “genius was unleashed,” writes biog­ra­ph­er Philip Steele. “The pre­cious mate­r­i­al that result­ed was a new under­stand­ing of the world.”

In Shakespeare’s case, only decades ear­li­er, the “plagues may have caused plays”—spurring poet­ry, fan­ta­sy, and the epic tragedies of King Lear, Mac­beth, and Antony and Cleopa­tra. New­ton too was appar­ent­ly inspired by cat­a­stro­phe.

These years of Newton’s life are some­times known in Latin as anni mirabilies, mean­ing “mar­velous years.” How­ev­er, they occurred at the same time as two nation­al dis­as­ters. In June 1665, the bubon­ic plague broke out in Lon­don…. As the plague spread out into the coun­try­side, there was pan­ic. Cam­bridge Uni­ver­si­ty was closed. By Octo­ber, 70,000 peo­ple had died in the cap­i­tal alone.

New­ton left Cam­bridge for his home in Wool­sthor­pe. The fol­low­ing year, the Great Fire of Lon­don dev­as­tat­ed the city. As hor­ri­fy­ing as these events were for the thou­sands who lived through them, “some of those dis­placed by the epi­dem­ic,” writes Stephen Porter, “were able to put their enforced break from their nor­mal rou­tines to good effect.” But none more so than New­ton, who “con­duct­ed exper­i­ments refract­ing light through a tri­an­gu­lar prism and evolved the the­o­ry of colours, invent­ed the dif­fer­en­tial and inte­gral cal­cu­lus, and con­ceived of the idea of uni­ver­sal grav­i­ta­tion, which he test­ed by cal­cu­lat­ing the motion of the moon around the earth.”

Right out­side the win­dow of Newton’s Wool­sthor­pe home? “There was an apple tree,” The Wash­ing­ton Post writes. “That apple tree.” The apple-to-the-head ver­sion of the sto­ry is “large­ly apoc­ryphal,” but in his account, Newton’s assis­tant John Con­duitt describes the idea occur­ring while New­ton was “mus­ing in a gar­den” and con­ceived of the falling apple as a mem­o­rable illus­tra­tion. New­ton did not have Net­flix to dis­tract him, nor con­tin­u­ous scrolling through Twit­ter or Face­book to freak him out. It’s also true he prac­ticed “social dis­tanc­ing” most of his life, writ­ing strange apoc­a­lyp­tic proph­e­sies when he wasn’t lay­ing the foun­da­tions for clas­si­cal physics.

Maybe what New­ton shows us is that it takes more than extend­ed time off in a cri­sis to do great work—perhaps it also requires that we have dis­ci­pline in our soli­tude, and an imag­i­na­tion that will not let us rest. Maybe we also need the leisure and the access to take pen­sive strolls around the gar­den, not some­thing essen­tial employ­ees or par­ents of small chil­dren home from school may get to do. But those with more free time in this new age of iso­la­tion might find the changes forced on us by a pan­dem­ic actu­al­ly do inspire the work that mat­ters to them most.

via The Wash­ing­ton Post

Relat­ed Con­tent:

In 1704, Isaac New­ton Pre­dicts the World Will End in 2060

Sir Isaac Newton’s Papers & Anno­tat­ed Prin­cip­ia Go Dig­i­tal

Isaac Newton’s Recipe for the Myth­i­cal ‘Philosopher’s Stone’ Is Being Dig­i­tized & Put Online (Along with His Oth­er Alche­my Man­u­scripts)

Josh Jones is a writer and musi­cian based in Durham, NC. Fol­low him at @jdmagness

The Story of Physics Animated in 4 Minutes: From Galileo and Newton, to Einstein

No mat­ter how well you remem­ber your physics class­es, you most like­ly don’t remem­ber learn­ing any sto­ries in them. The­o­ries and equa­tions, yes, but not sto­ries — yet each of those the­o­ries and equa­tions has a sto­ry behind it, as does the entire sci­en­tif­ic enter­prise of physics they con­sti­tute. The video above from the BBC’s Dara Ó Bri­ain’s Sci­ence Club pro­vides an overview of the lat­ter sto­ry in an ani­mat­ed four min­utes, mak­ing it ide­al for young­sters just start­ing to learn about physics. It will also do the job for those of us not-so-young­sters cir­cling back to get a bet­ter grasp of physics, its dis­cov­er­ies and dri­ving ques­tions.

“The sto­ry of physics is, for the most part, a tale of ever-increas­ing con­fi­dence,” says Ó Bri­ain, a come­di­an as well as a tele­vi­sion host and writer on var­i­ous sub­jects. This ver­sion of the sto­ry begins with rolling balls and falling objects, observed with a new rig­or by such 17th-cen­tu­ry Ital­ians as Galileo Galilei. Galileo’s work became “the rock on which mod­ern physics is found­ed,” and those who first built upon that rock includ­ed Isaac New­ton, who start­ed by notic­ing how apples fall and end­ed up with a the­o­ry of grav­i­ty. New­ton’s work would lat­er pre­dict the exis­tence of Nep­tune; James Clerk Maxwell, work­ing in the 19th cen­tu­ry, made dis­cov­er­ies about elec­tro­mag­net­ism that would lat­er give us radio and tele­vi­sion.

For quite a while, physics seemed to go from strength to strength. But as the 20th cen­tu­ry began, “the lat­est dis­cov­er­ies did­n’t build on the old ones. Things like x‑rays and radioac­tiv­i­ty were just plain weird, and in a bad way.” But in 1905, onto the scene came a 26-year-old Albert Ein­stein, who “tore up the script by” claim­ing that “light is a kind of wave but also comes in pack­ets, or par­ti­cles.” That same year he pub­lished an equa­tion you’ll cer­tain­ly remem­ber from your school days: E = mc2, which holds “that mass and ener­gy are equiv­a­lent.” Ein­stein pro­posed that, if “some­one watch­es a space­ship fly­ing very fast, what they would see is the ship’s clocks run­ning slow­er than their own watch — and the ship will actu­al­ly shrink in size. But for the astro­nauts inside, all would be nor­mal.”

In oth­er words, “time and space can change: they are rel­a­tive depend­ing on who’s observ­ing.” Ein­stein called this “spe­cial rel­a­tiv­i­ty,” and he also had a the­o­ry of “gen­er­al rel­a­tiv­i­ty.” That showed “how balls and apples weren’t the only thing sub­ject to grav­i­ty: light, time, and space were also affect­ed. Grav­i­ty slows down time and it warps space.” No mat­ter how dim­ly we under­stand physics itself, we all know the major play­ers in its sto­ry: Galileo and New­ton made impor­tant ear­ly dis­cov­er­ies, but it was Ein­stein who “shat­tered tra­di­tion­al physics” and revealed just how much we still have to learn about phys­i­cal real­i­ty. Still today, physi­cists labor to rec­on­cile Ein­stein’s dis­cov­er­ies with all oth­er known facts of that real­i­ty. As frus­trat­ing as that task often proves, the kids who take an inter­est of their own in physics after watch­ing the video will sure­ly be heart­ened to know that the sto­ry of physics goes on.

via The Kids Should See This

Relat­ed Con­tent:

Free Online Physics Cours­es (part of our larg­er col­lec­tion, 1,500 Free Online Cours­es from Top Uni­ver­si­ties)

The Map of Physics: Ani­ma­tion Shows How All the Dif­fer­ent Fields in Physics Fit Togeth­er

The Case for Study­ing Physics in a Charm­ing Ani­mat­ed Video

Physics & Caf­feine: Stop Motion Film Uses a Cup of Cof­fee to Explain Key Con­cepts in Physics

The Feyn­man Lec­tures on Physics, The Most Pop­u­lar Physics Book Ever Writ­ten, Is Now Com­plete­ly Online

Based in Seoul, Col­in Mar­shall writes and broad­casts on cities, lan­guage, and cul­ture. His projects include the book The State­less City: a Walk through 21st-Cen­tu­ry Los Ange­les and the video series The City in Cin­e­ma. Fol­low him on Twit­ter at @colinmarshall or on Face­book.

Leonardo da Vinci’s Inventions Come to Life as Museum-Quality, Workable Models: A Swing Bridge, Scythed Chariot, Perpetual Motion Machine & More

Per­pet­u­al motion is impos­si­ble. Even if we don’t know much about physics, we all know that to be true — or at least we’ve heard it from cred­i­ble enough sources that we might as well believe it. More accu­rate­ly, we might say that nobody has yet fig­ured out how to make a machine that keeps on going and going and going by itself, with­out any exter­nal ener­gy source. But it has­n’t been for lack of try­ing, and the effort has been on the part of not just crack­pots but some of the most impres­sive minds in human his­to­ry. Take char­ter mem­ber of that group Leonar­do da Vin­ci, the Renais­sance design­er of bridges, musi­cal instru­ments, war machines, and much else beside, whose fas­ci­na­tion with the sub­ject also had him imag­in­ing the occa­sion­al per­pet­u­al motion machine.

Our unflag­ging fas­ci­na­tion with Leonar­do has fueled the efforts of 21st-cen­tu­ry enthu­si­asts to build his inven­tions for them­selves, even those inven­tions that pre­vi­ous­ly exist­ed only in his note­books. In the video above you can see a series of such Leonar­do-imag­ined devices made real in func­tion­al mod­el form.

Some of them, like the fly­wheel, odome­ter, ver­ti­cal ball-bear­ing, and dou­ble-deck­er bridge, have become so com­mon in oth­er forms that we no longer even stop to con­sid­er their inge­nious­ness. Oth­ers, like the invad­er-repelling cas­tle wall defense mech­a­nism and some­thing called a “scythed char­i­ot” — a nasty-look­ing yet char­ac­ter­is­ti­cal­ly grace­ful piece of work — remind of us that, at least in most of the world, we live in less war­like times than Leonar­do did.

The video comes from Valeriy Ivanov, who on Youtube spe­cial­izes in build­ing and demon­strat­ing “work­ing mod­els of per­pet­u­al motion machines” as well as “Da Vin­ci inven­tions” and “mar­ble machines.” (Leonar­do’s odome­ter, fea­tured in the video, makes a par­tic­u­lar­ly impres­sive use of mar­bles.) “My mod­els of per­pet­u­al motion machines are of motor­ized ver­sions that were built to illus­trate how they were sup­posed to work in the minds of inven­tors,” writes Ivanov. We see not only the mechan­ics Leonar­do and oth­er hope­ful inven­tors must have imag­ined, but the mes­mer­iz­ing ele­gance of Leonar­do’s designs in par­tic­u­lar, such as the video’s over­bal­anced wheel. On a note­book page from 1494, Leonar­do told the seek­ers of per­pet­u­al motion to “go and take your place with the alchemists.” But now, with the aid of tech­nol­o­gy unimag­ined in Leonar­do’s time — even by Leonar­do him­self — we can see just how com­pelling that vision must have been.

Relat­ed Con­tent:

MIT Researchers 3D Print a Bridge Imag­ined by Leonar­do da Vin­ci in 1502— and Prove That It Actu­al­ly Works

How to Build Leonar­do da Vinci’s Inge­nious Self-Sup­port­ing Bridge: Renais­sance Inno­va­tions You Can Still Enjoy Today

Leonar­do da Vin­ci Draws Designs of Future War Machines: Tanks, Machine Guns & More

Watch Leonar­do da Vinci’s Musi­cal Inven­tion, the Vio­la Organ­ista, Being Played for the Very First Time

A Com­plete Dig­i­ti­za­tion of Leonar­do Da Vinci’s Codex Atlanti­cus, the Largest Exist­ing Col­lec­tion of His Draw­ings & Writ­ings

Leonar­do da Vinci’s Ele­gant Design for a Per­pet­u­al Motion Machine

Based in Seoul, Col­in Mar­shall writes and broad­casts on cities, lan­guage, and cul­ture. His projects include the book The State­less City: a Walk through 21st-Cen­tu­ry Los Ange­les and the video series The City in Cin­e­ma. Fol­low him on Twit­ter at @colinmarshall or on Face­book.

Download Beautiful Free Posters Celebrating the Achievements of Living Female STEM Leaders

Remem­ber the posters that dec­o­rat­ed your child­hood or teenaged bed­room?

Of course you do.

Whether aspi­ra­tional or inspi­ra­tional, these images are amaz­ing­ly potent.

I’m a bit embar­rassed to admit what hung over my bed, espe­cial­ly in light of a cer­tain CGI adap­ta­tion…

No such wor­ries with a set of eight free down­load­able posters hon­or­ing eight female trail­blaz­ers in the fields of sci­ence, tech­nol­o­gy, engi­neer­ing, and math.

These should prove ever­green.


Com­mis­sioned by Nev­er­the­less, a pod­cast that cel­e­brates women whose advance­ments in STEM fields have shaped—and con­tin­ue to shape—education and learn­ing, each poster is accom­pa­nied with a brief bio­graph­i­cal sketch of the sub­ject.

Nev­er­the­less has tak­en care that the fea­tured achiev­ers are drawn from a wide cul­tur­al and racial pool.

No shame if you’re unfa­mil­iar with some of these extra­or­di­nary women. Their names may not pos­sess the same degree of house­hold recog­ni­tion as Marie Curie, but they will once they’re hang­ing over your daughter’s (or son’s) bed.

It’s worth not­ing that with the excep­tion of the under­sung moth­er of DNA Helix Ros­alind Franklin, these are liv­ing role mod­els. They are:

Astro­naut Dr. Mae Jemi­son

Robot­ics pio­neer Dr. Cyn­thia Breazeal

Math­e­mati­cian Gladys West

Tech inno­va­tor Juliana Rotich

Phar­ma­ceu­ti­cal chemist Tu Youy­ou

Bio­phar­ma­cist and women rights advo­cate Maria da Pen­ha

Biotech­nol­o­gist Dr. Hay­at Sin­di

Kudos, too, to Nev­er­the­less for includ­ing biogra­phies of the eight female illus­tra­tors charged with bring­ing the STEM lumi­nar­ies to aes­thet­i­cal­ly cohe­sive graph­ic life: Lidia Toma­shevskaya,Thandi­we Tsha­bal­alaCami­la RosaXu HuiKari­na PerezJoana NevesGene­va B, and Juli­ette Bro­cal

Lis­ten to Nev­er­the­less’ episode on STEM Role Mod­els here.

Down­load Nev­er­the­less’ free posters in Eng­lish here. You can also down­load zipped fold­ers con­tain­ing all eight posters trans­lat­ed into Brazil­ian Por­tugueseFrenchFrench Cana­di­anGer­manItal­ianSpan­ish, and Sim­pli­fied Chi­nese.

Relat­ed Con­tent:

Pop Art Posters Cel­e­brate Pio­neer­ing Women Sci­en­tists: Down­load Free Posters of Marie Curie, Ada Lovelace & More

Women Sci­en­tists Launch a Data­base Fea­tur­ing the Work of 9,000 Women Work­ing in the Sci­ences

“The Matil­da Effect”: How Pio­neer­ing Women Sci­en­tists Have Been Denied Recog­ni­tion and Writ­ten Out of Sci­ence His­to­ry

Ayun Hal­l­i­day is an author, illus­tra­tor, the­ater mak­er and Chief Pri­ma­tol­o­gist of the East Vil­lage Inky zine.  Join her in NYC on Mon­day, Jan­u­ary 6 when her month­ly book-based vari­ety show, Necro­mancers of the Pub­lic Domaincel­e­brates Cape-Cod­di­ties (1920) by Roger Liv­ingston Scaife. Fol­low her @AyunHalliday

Richard Feynman’s “Lost Lecture:” An Animated Retelling

Nobel prize-win­ning physi­cist Richard Feyn­man is “famous in a num­ber of dimen­sions,” says sci­ence and math explain­er Grant Sander­son of the YouTube chan­nel 3blue1brown in the video above. “To sci­en­tists, he’s a giant of 20th cen­tu­ry physics… to the pub­lic, he’s a refresh­ing con­tra­dic­tion to the stereo­types about physi­cists: a safe-crack­ing, bon­go-play­ing, mild­ly phi­lan­der­ing non-con­formist.” Feyn­man is also famous, or infa­mous, for his role in the Man­hat­tan Project and the build­ing of the first atom­ic bomb, after which the FBI kept tabs on him to make sure he would­n’t, like his col­league Klaus Fuchs, turn over nuclear secrets to the Sovi­ets.

He may have led an excep­tion­al­ly event­ful life for an aca­d­e­m­ic sci­en­tist, but to his stu­dents, he was first and fore­most “an excep­tion­al­ly skill­ful teacher… for his uncan­ny abil­i­ty to make com­pli­cat­ed top­ics feel nat­ur­al and approach­able.” Feynman’s teach­ing has since influ­enced mil­lions of read­ers of his wild­ly pop­u­lar mem­oirs and his lec­ture series, record­ed at Cal­tech and pub­lished in three vol­umes in the ear­ly 1960s. (Also see his famous course taught at Cor­nell.) For decades, Feyn­man fans could list off­hand sev­er­al exam­ples of the physicist’s acu­men for explain­ing com­plex ideas in sim­ple, but not sim­plis­tic, terms.

But it wasn’t until the mid-nineties that the pub­lic had access to one of the finest of his Cal­tech lec­tures. Dis­cov­ered in the 1990s and first pub­lished in 1996, the “lost lecture”—titled “The Motion of the Plan­ets Around the Sun”—“uses noth­ing more than advanced high school geom­e­try to explain why the plan­ets orbit the sun ellip­ti­cal­ly rather than in per­fect cir­cles,” as the Ama­zon descrip­tion sum­ma­rizes. You can pur­chase a copy for your­self, or hear it Feyn­man deliv­er for free just below.

Feyn­man gave the talk as the guest speak­er in a 1964 fresh­man physics class. He address­es them, he says, “just for the fun of it”; none of the mate­r­i­al would be on the test. Nev­er­the­less, he end­ed up host­ing an infor­mal 20-minute Q&A after­wards. Giv­en his audi­ence, Feyn­man assumes only the most basic pri­or knowl­edge of the sub­ject: an expla­na­tion for why the plan­ets make ellip­ti­cal orbit around the sun. “It ulti­mate­ly has to do with the inverse square law,” says Sander­son, “but why?”

Part of the prob­lem with the lec­ture, as its dis­cov­er­ers David and Judith Goodstein—husband and wife physi­cist and archivist at Caltech—found, involves Feynman’s exten­sive ref­er­ence to fig­ures he draws on the black­board. It took some time for the two to dig these dia­grams up in a set of class notes. In Sanderson’s video at the top, we get some­thing per­haps even bet­ter: ani­mat­ed phys­i­cal rep­re­sen­ta­tions of the math­e­mat­ics that deter­mine plan­e­tary motion. We need not know this math in depth to grasp what Feyn­man calls his “ele­men­tary” expla­na­tion.

“Ele­men­tary” in this case, despite com­mon usage, does not mean “easy,” Feyn­man says. It means “that very lit­tle is required to know ahead of time in order to under­stand it, except to have an infi­nite amount of intel­li­gence.” That last part is a typ­i­cal bit of humor. Even those of who haven’t pur­sued math or physics much beyond the high school lev­el can learn the basic out­lines of plan­e­tary motion in Feynman’s wit­ty lec­ture, sup­ple­ment­ed by the video visu­al aids Sander­son offers at the top.

Relat­ed Con­tent:

The Feyn­man Lec­tures on Physics, The Most Pop­u­lar Physics Book Ever Writ­ten, Is Now Com­plete­ly Online

‘The Char­ac­ter of Phys­i­cal Law’: Richard Feynman’s Leg­endary Course Pre­sent­ed at Cor­nell, 1964

The Richard Feyn­man Tril­o­gy: The Physi­cist Cap­tured in Three Films

Learn How Richard Feyn­man Cracked the Safes with Atom­ic Secrets at Los Alam­os

Richard Feyn­man on the Bon­gos

Richard Feyn­man Plays the Bon­gos

Josh Jones is a writer and musi­cian based in Durham, NC. Fol­low him at @jdmagness

The Phenomena of Physics Illustrated with Psychedelic Art in an Influential 19th-Century Textbook

The sci­ence of optics and the fine art of sci­ence illus­tra­tion arose togeth­er in Europe, from the ear­ly black-and-white col­or wheel drawn by Isaac New­ton in 1704 to the bril­liant­ly hand-col­ored charts and dia­grams of Goethe in 1810. Goethe’s illus­tra­tions are more renowned than Newton’s, but both inspired a con­sid­er­able num­ber of sci­en­tif­ic artists in the 19th cen­tu­ry. It would take a sci­ence writer, the French jour­nal­ist and math­e­mati­cian Amédée Guillemin, to ful­ly grasp the poten­tial of illus­tra­tion as a means of con­vey­ing the mind-bend­ing prop­er­ties of light and col­or to the gen­er­al pub­lic.

Guillemin pub­lished the huge­ly pop­u­lar text­book Les phénomènes de la physique in 1868, even­tu­al­ly expand­ing it into a five-vol­ume physics ency­clo­pe­dia. (View and down­load a scanned copy at the Well­come Col­lec­tion.) He real­ized that in order to make abstract the­o­ries “com­pre­hen­si­ble” to lay read­ers, Maria Popo­va writes at Brain Pick­ings, “he had to make their ele­gant abstract math­e­mat­ics tan­gi­ble and cap­ti­vat­ing for the eye. He had to make physics beau­ti­ful.” Guillemin com­mis­sioned artists to make 31 col­ored lith­o­graphs, 80 black-and-white plates, and 2,012 illus­trat­ed dia­grams of the phys­i­cal phe­nom­e­na he described.

The most “psy­che­del­ic-look­ing illus­tra­tions,” notes the Pub­lic Domain Review, are by Parisian intaglio print­er and engraver René Hen­ri Digeon and “based on images made by the physi­cist J. Sil­ber­mann show­ing how light waves look when they pass through var­i­ous objects, rang­ing from a bird’s feath­er to crys­tals mount­ed and turned in tour­ma­line tongs.”

Digeon also illus­trat­ed the “spec­tra of var­i­ous light sources, solar, stel­lar, metal­lic, gaseous, elec­tric,” above, and cre­at­ed a col­or wheel, fur­ther down, based on a clas­si­fi­ca­tion sys­tem of French chemist Michel Eugène Chevreul.

Many of Digeon’s images “were used to explain the phe­nom­e­non of bire­frin­gence, or dou­ble refrac­tion,” the Pub­lic Domain Review writes (hence the dou­ble rain­bow). In addi­tion to his strik­ing plates, this sec­tion of the book also includes the image of the soap bub­ble above, by artist M. Rap­ine, based on a paint­ing by Alexan­dre-Blaise Des­goffe.

[The artists’] sub­jects were not cho­sen hap­haz­ard­ly. New­ton was famous­ly inter­est­ed in the iri­des­cence of soap bub­bles. His obser­va­tions of their refrac­tive capac­i­ties helped him devel­op the undu­la­to­ry the­o­ry of light. But he was no stranger to feath­ers either. In the Opticks (1704), he not­ed with won­der that, “by look­ing on the Sun through a Feath­er or black Rib­band held close to the Eye, sev­er­al Rain-bows will appear.”

In turn, Guillemin’s lav­ish­ly illus­trat­ed ency­clo­pe­dia con­tin­ues to influ­ence sci­en­tif­ic illus­tra­tions of light and col­or spec­tra. “In order thus to place itself in com­mu­nion with Nature,” he wrote, “our intel­li­gence draws from two springs, both bright and pure, and equal­ly fruitful—Art and Sci­ence.” See more art from the book at Brain Pick­ings and the Pub­lic Domain Review.

Relat­ed Con­tent:

The Vibrant Col­or Wheels Designed by Goethe, New­ton & Oth­er The­o­rists of Col­or (1665–1810)

Goethe’s Col­or­ful & Abstract Illus­tra­tions for His 1810 Trea­tise, The­o­ry of Col­ors: Scans of the First Edi­tion

A 900-Page Pre-Pan­tone Guide to Col­or from 1692: A Com­plete Dig­i­tal Scan

Josh Jones is a writer and musi­cian based in Durham, NC. Fol­low him at @jdmagness

Stephen Hawking’s Black Hole Paradox Explained in Animation

Many of us have heard of Stephen Hawk­ing but know him only as a sym­bol of a pow­er­ful mind ded­i­cat­ed for a life­time to the thorni­est prob­lems in astro­physics. Even more of us have heard of black holes but know of them only as those dan­ger­ous things in sci-fi movies that suck in space­ships. But if we gain an under­stand­ing of Hawk­ing’s work on black holes, how­ev­er basic, we gain a much clear­er view of both enti­ties and what they mean to the human endeav­or of grasp­ing the work­ings of real­i­ty. What it all has to do with “one of the biggest para­dox­es in the uni­verse,” and why that para­dox “threat­ens to unrav­el mod­ern sci­ence,” pro­vide the sub­ject mat­ter for the ani­mat­ed TED-Ed les­son above.

In order to explain what’s called the “Black Hole Infor­ma­tion Para­dox,” astro­physi­cist Fabio Pacuc­ci must first explain “infor­ma­tion,” which in this usage con­sti­tutes every part of the real­i­ty in which we live. “Typ­i­cal­ly, the infor­ma­tion we talk about is vis­i­ble to the naked eye,” he says. “This kind of infor­ma­tion tells us that an apple is red, round, and shiny.” But what physi­cists care about is “quan­tum infor­ma­tion,” which “refers to the quan­tum prop­er­ties of all the par­ti­cles that make up that apple, such as their posi­tion, veloc­i­ty and spin.” The par­ti­cles that make up every object of the uni­verse have “unique quan­tum prop­er­ties,” and the laws of physics as cur­rent­ly under­stood hold that “the total amount of quan­tum infor­ma­tion in the uni­verse must be con­served.”

Smash the apple into sauce, in oth­er words, and you don’t cre­ate or destroy any quan­tum infor­ma­tion, you just move it around. But in the parts of space­time with grav­i­ty so strong that noth­ing can escape them, bet­ter known as black holes, that par­tic­u­lar law of physics may not apply. “When an apple enters a black hole, it seems as though it leaves the uni­verse, and all its quan­tum infor­ma­tion becomes irre­triev­ably lost,” says Pacuc­ci. “How­ev­er, this doesn’t imme­di­ate­ly break the laws of physics. The infor­ma­tion is out of sight, but it might still exist with­in the black hole’s mys­te­ri­ous void.”

Then we have Hawk­ing Radi­a­tion, the epony­mous genius’ con­tri­bu­tion to the study of black holes, which shows that “black holes are grad­u­al­ly evap­o­rat­ing,” los­ing mass over “incred­i­bly long peri­ods of time” in such a way that sug­gests that “a black hole and all the quan­tum infor­ma­tion it con­tains could be com­plete­ly erased” in the process. What might go into the black hole as an apple’s infor­ma­tion does­n’t come out look­ing like an apple’s infor­ma­tion. Quan­tum infor­ma­tion seems to be destroyed by black holes, yet every­thing else about quan­tum infor­ma­tion tells us it can’t be destroyed: like any para­dox, or con­tra­dic­tion between two known or prob­a­ble truths, “the destruc­tion of infor­ma­tion would force us to rewrite some of our most fun­da­men­tal sci­en­tif­ic par­a­digms.”

But for a sci­en­tist in the Hawk­ing mold, this dif­fi­cul­ty just makes the chase for knowl­edge more inter­est­ing. Pacuc­ci cites a few hypothe­ses: that “infor­ma­tion actu­al­ly is encod­ed in the escap­ing radi­a­tion, in some way we can’t yet under­stand,” that “the para­dox is just a mis­un­der­stand­ing of how gen­er­al rel­a­tiv­i­ty and quan­tum field the­o­ry inter­act, that “a solu­tion to this and many oth­er para­dox­es will come nat­u­ral­ly with a ‘uni­fied the­o­ry of every­thing,’ ” and most bold­ly that, because “the 2D sur­face of an event hori­zon” — the inescapable edge of a black hole — “can store quan­tum infor­ma­tion,” the bound­ary of the observ­able uni­verse “is also a 2D sur­face encod­ed with infor­ma­tion about real, 3D objects,” imply­ing that “real­i­ty as we know it is just a holo­graph­ic pro­jec­tion of that infor­ma­tion.” Big if true, as they say, but as Hawk­ing seems to have known, the truth about our real­i­ty is sure­ly big­ger than any of us can yet imag­ine.

via Brain Pick­ings

Relat­ed Con­tent:

Stephen Hawking’s Final Book and Sci­en­tif­ic Paper Just Got Pub­lished: Brief Answers to the Big Ques­tions and “Infor­ma­tion Para­dox”

Stephen Hawking’s Lec­tures on Black Holes Now Ful­ly Ani­mat­ed with Chalk­board Illus­tra­tions

Watch A Brief His­to­ry of Time, Errol Mor­ris’ Film About the Life & Work of Stephen Hawk­ing

Stephen Hawking’s Uplift­ing Mes­sage: You Can Get Your­self Out of Any Hole, No Mat­ter What Their Size

The Largest Black Holes in the Uni­verse: A Visu­al Intro­duc­tion

Watch a Star Get Devoured by a Super­mas­sive Black Hole

Based in Seoul, Col­in Mar­shall writes and broad­casts on cities, lan­guage, and cul­ture. His projects include the book The State­less City: a Walk through 21st-Cen­tu­ry Los Ange­les and the video series The City in Cin­e­ma. Fol­low him on Twit­ter at @colinmarshall or on Face­book.

Richard Feynman’s Technique for Learning Something New: An Animated Introduction

I some­times won­der: why do peo­ple post ama­teur repair videos, made with smart­phones in kitchens and garages, with no obvi­ous com­mer­cial val­ue and, often, a lev­el of exper­tise just min­i­mal­ly above that of their view­ers? Then I remem­ber Richard Feyn­man’s prac­ti­cal advice for how to learn some­thing new—prepare to teach it to some­body else.

The extra account­abil­i­ty of mak­ing a pub­lic record might pro­vide added moti­va­tion, though not near­ly to the degree of mak­ing teach­ing one’s pro­fes­sion. Nobel-win­ning physi­cist Feyn­man spent the first half of his aca­d­e­m­ic career work­ing on the Man­hat­tan Project, dodg­ing J. Edgar Hoover’s FBI at the begin­ning of the Cold War, and mak­ing major break­throughs in quan­tum mechan­ics.

But he has become as well-known for his teach­ing as for his his­toric sci­en­tif­ic role, thanks to the enor­mous­ly pop­u­lar series of physics lec­tures he devel­oped at Cal­tech; his fun­ny, acces­si­ble, best-sell­ing books of essays and mem­oirs; and his will­ing­ness to be an avun­cu­lar pub­lic face for sci­ence, with a knack for explain­ing things in terms any­one can grasp.

Feyn­man revealed that he him­self learned through what he called a “note­book tech­nique,” an exer­cise con­duct­ed pri­mar­i­ly on paper. Yet the method came out of his ped­a­gogy, essen­tial­ly a means of prepar­ing lec­ture notes for an audi­ence who know about as much about the sub­ject as you did when you start­ed study­ing it. In order to explain it to anoth­er, you must both under­stand the sub­ject your­self, and under­stand what it’s like not to under­stand it.

Learn Feynman’s method for learn­ing in the short ani­mat­ed video above. You do not actu­al­ly need to teach, only pre­tend as if you’re going to—though prepar­ing for an actu­al audi­ence will keep you on your toes. In brief, the video sum­ma­rizes Feynman’s method in a three-step process:

  1. Choose a top­ic you want to under­stand and start study­ing it.
  2. Pre­tend you’re teach­ing the idea to some­one else. Write out an expla­na­tion on the paper…. When­ev­er you get stuck, go back and study.
  3. Final­ly do it again, but now sim­pli­fy your lan­guage or use an anal­o­gy to make the point.

Get ready to start your YouTube chan­nel with home­made lan­guage lessons, restora­tion projects, and/or cook­ing videos. You may not—nor should you, perhaps—become an online author­i­ty, but accord­ing to Fey­man, who learned more in his life­time than most of us could in two, you’ll come away great­ly enriched in oth­er ways.

Relat­ed Con­tent:

Richard Feynman’s “Note­book Tech­nique” Will Help You Learn Any Subject–at School, at Work, or in Life

The Feyn­man Lec­tures on Physics, The Most Pop­u­lar Physics Book Ever Writ­ten, Is Now Com­plete­ly Online

The Draw­ings & Paint­ings of Richard Feyn­man: Art Express­es a Dra­mat­ic “Feel­ing of Awe”

Josh Jones is a writer and musi­cian based in Durham, NC. Fol­low him at @jdmagness

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