5 million terabytes of information. That's what you get when you bundle up all of the emails, videos, photos, web sites and sundry materials available on the web. Now here's the big question: how much does all of that information weigh? No spoilers here. We'll let the folks at VSauce give you the answer.

PS The 5 million terabytes figure was given by Eric Schmidt in 2005. So the figure is a bit dated, but it doesn't take away from the gist of the exercise...