You might not think too much about numbers as you sit and use your computer, but the underpinnings of software and images are based on them—and that means, in theory, a string of numerical characters can in fact be illegal.

Imagine a piece of dodgy software or an illegal image: they're all characterized, at their heart, by a massive chain of binary numbers. This video, by the guys over at Numberphile, dives into how and why numbers can contravene the law—and it turns out that it's a far more murky and complex world than you might've expected. [Numperphile]