An important American string theorist, Brian Greene hasn't shied away from bringing heady theoretical physics to the broader public. His 1999 bestselling book, The Elegant Universe, introduced string theory to non specialists, and it was later adapted into a three hour, Emmy award-winning television series by NOVA. (You can buy it on DVD, or simply watch it online here.) Now, on RichardDawkins.Net, Greene hosts a short video that takes us into the speculative world of "hidden dimensions." If borne out, these theories could entirely reframe our understanding of the Big Bang and where our world fits into the larger cosmos. You can find more videos along these lines on RichardDawkins.net, and also on his related YouTube Channel (which happens to appear in our collection of Intelligent YouTube Channels).