One of the greatest puzzles of modern times has been solved using some sketchy maths and some fruit.
The internet, it turns out, weighs as much as a strawberry. Professor John Kubiatowicz, from the University of California, Berkeley, worked out that weight of all the electrons in motion that make up the internet at any one moment is equivalent to 50 grams. Or, the weight of a strawberry.
He also calculated that filling a 4GB Kindle would increase its weight by a billionth of a billionth of a gram, or 0.000000000000000001g, using Einstein's E=mc² formula, which states that energy and mass are directly related.
Aren't you glad you know that now?