The U.S. is 42nd in life expectancy in the world. Who has the highest life expectancy, and how do they live longer than everyone else? See more »

You may never have thought about it (unless your child asks), but boogers are sticky for a perfectly logical scientific reason. See more »

Most people's organs follow the same basic layout -- heart on the left, appendix on the right and stomach in the middle. But in about 1 in 10,000 births, organs end up on the opposite side. See more »

By waxing, shaving, plucking and shearing, we manage to keep unwanted hairs at bay. But considering how much you shell out for new razors and your trips to the salon, it's a wonder that we bend over backward to groom a bunch of dead cells. See more »

During early pregnancy, both male and female human embryos develop something called milk lines, ridges that eventually recede into nipples. Why have some species lost this unisex trait, and can human men actually produce milk? See more »

Eyebrows serve as a beauty trait, and they're also used to add expression to your face. But is that the only purpose they serve? Why do we have them, and what would happen if they went away? See more »

If you've ever considered burning them off for various nefarious purposes, you may want to reconsider. Those babies are more than just loopy tools of identification. See more »

Why don't you have two hearts? Here's a hint: It's the same reason why you have one liver, but two eyes. Would a second heart help you live better? See more »

Why does the combination of orange juice and toothpaste have to taste so awful? Why can't your sense of taste resolve the problem? See more »

Some causes of death stand out for their sheer level of peculiarity. See our list of 7 strange ways to die, including being struck by a tortoise falling from the air and laughing too hard. See more »