Michael Stevens knows something about viral videos. Yes, he’s a Googler who works on Programming Strategy at YouTube. That gives him some professional bona fides. But he also rolls up his sleeves and produces his own wildly popular videos under the Vsauce banner. Perhaps you’ll remember when Stevens asked the question late last year: Just how much does the entire internet — all 5 million terabytes of information — actually weigh? (That got 1.3 million views, putting it certainly into viral territory.) Two weeks ago, Stevens returned with another tantalizing question: What color is a mirror? Hint: It’s not what you think. And now, just two days ago, he dropped this question on us: What would happen if everyone on the planet jumped at once? Catch it below.