How do neurons actually work? Maybe you've heard that it involves electricity, but does that mean you've got little zaps and lightning bolts running through your veins like Pikachu? Don't worry, here we are to set you straight on what a neuron is, what an action potential is, and how fast your nervous system really communicates.

Why does sex exist? You might think the obvious answer is "reproduction" but there are plenty of organisms on Earth that don't require sex to reproduce. And the more that scientists examined sex, the more they realized that it's an expensive and inefficient way to get your genes to the next generation. The true purpose of sex is actually one of the longest-standing mysteries in biology.