So, the human penis is fairly smooth. But, on the contrary, chimp penises have small barbs––which are designed to irritate female chimp’s vaginas upon removal, making it so she avoids mating with other chimps after procreating (not chill, we know). Plenty of scientists believe that, like so many of our primate cousins, the original male penis was barbed as well.

Circumcised foreskins have an unlikely use in the world of healthcare: They can be used to grow skin grafts for burn victims. The ethics around this, of course, are still up for debate.

In some ways, red is the opposite of blue. Red speeds up our heart rate, blood flow, and body temperature. Red stimulates our senses of smell and taste, making us more sensitive to our environments. Red also stimulates the adrenal gland, making us more prone to take action and giving us more energy. Red is a physical stimulant.

Red stands for many things, all of them potent. Red is romantic love, and its physical passion. Red is violence, anger, and aggression, and it frequently indicates danger. Paradoxically–for a color associated with action and energy–red is universally used as the color that means "stop." Red is used professionally to capture attention, elicit emotion, and convey confidence.

Did you know that taking accutane can stain your bones green.

Snails can travel just over one mph and so can get 25 metres in the 24 hours.