Plica semilunaris (third eyelid)
You may not know it, but you have a third eyelid. Pull open the two more noticeable eyelids and take a look - it's located right in the corner by the tear duct. The third eyelid is left over from what's known as a "nictitating membrane," which is still present in animals like chickens, lizards and sharks.
No doubt we were once hairier. Up until about 3 million years ago, we were covered with it. But by the time Homo erectus arrived, the ability to sweat meant we could shed our wooly ways.
Doctors don't really know much about sinuses, only that we have a lot of them. Possibilities for their function range from insulating our eyes to changing the pitch and tone of our voice.
Adenoids trap bacteria, but they're also prone to swelling and infection. Just ask any 7-year-old. Luckily, our adenoids shrink with age and are often removed, along with ...
Also prone to swelling and infection. If you have them by your 30s, it's almost an accomplishment.
More useful as a game-winning Scrabble word than part of the anatomy, the coccyx, or tailbone, is several fused vertebrae left over from the olden days when we had tails.
When were hairier (see No. 9), the erector pili made the hairs stand on end when we needed to appear bigger and scarier. Now, it just gives us goose bumps.
Back in the day, when we ate mammoth meat off the bone and didn't floss afterward, our teeth tended to fall out. Therefore, when those reserve molars, aka "wisdom teeth," came in they were welcomed. Nowadays, fluoride and dental plans have just made them a huge pain.
Darwin claimed the appendix was useful for digestion during our early plant-eating years; it's dwindled down to little since we started eating more digestible foods.
Because, why? Thought: I can add organ that becomes useless after marriage.
58% of men have been sucker-punched. Men's Health's The Average Guy takes on all of a man's feints, jabs and KOs in the ring of life:
58% of men have been sucker punched
31% of men have sunk to kicking a guy in the you know what
55% of men have had a fight with their wife or girlfriend while behind the wheel
69% of men have intervened to save a buddy from getting pummeled
64% is the increase in the average guy's risk of developing heart disease if he nurses a grudge
21% of men admit to having fought on social media
25% of men enjoy posting trollish comments
80% of men have traded blows defending a woman's honor
20% of men have never put up their dukes
17% of men say they did not lose a fight they threw it
4% of dads have yelled at their kid's on the sofa
58% of men admit their own dad gave them praise for fighting as a child
49% of men have gotten into a shouting match with a co-worker
60% of men who've gotten into a shouting match with a co-worker wanted to cold-cock the dude
49% of men dwell on lost fights
57% of men regularly beat themselves up over dumb mistakes
52% of men think fighting has a place in sports other than hockey
29% of deluded men think they can survive a round with Georges St-Pierre
87 times is the number of arguments the average guy has with his partner each year about when to have sex
Top things that make the average guy want to fight:
A friend went back on his word
A trivial matter that escalated
Someone talked trash about him
Someone hurt a loved one
Tie: Someone spilled a secret and/or a friend cheated with his wife or girlfriend
Three stupid things Men's Health readers have come to blows over: a videogame win, turkey stuffing and a fart.