You could sweat when you’re anxious to alert others. One theory suggests we’ve evolved to sweat whilst anxious to alert the brains of other people around us so they are primed for whatever it is that’s making us anxious. Brain scans have revealed that when you sniff the sweat of a panic-induced person, regions of the brain that handle emotional and social signals light up. When you’re anxious your sympathetic nervous system releases hormones including adrenaline, which activates your sweat glands.
100 Mind-Blowing Evolved Facts
Humans did not come from monkeys. To be more precise, humans and monkeys had a common ancestor from 25-30 million years ago. From then, each species evolved differently.
Our bum crack is medically referred to as the intergluteal cleft. The crena is another formal term used for the cleavage of the buttocks. We have butt cracks mainly due to the preliminary muscles that sit inside the evolved pelvic bones.
Pigs can’t look up. You can’t tell a sad pig to look up – they physically can’t do that. Since their bodies evolved to prioritise finding food, pig necks can’t bend to let them look up at the sky.
As dogs were domesticated, their eyes evolved to look cuter. Have you ever seen a picture of a wolf’s eyes and seen something mysteriously menacing in them compared to those of a dog? Well, there’s a good reason for that. Dogs evolved muscles around their eyes, allowing them to change their facial expression slightly, commonly known as “puppy eyes.” It’s believed that they evolved so because dogs that looked cuter and friendlier were more likely to be looked after.
Reindeer in the Arctic can see the world in ultraviolet light. While we cannot see ultraviolet (UV) light, reindeer seem to have developed this ability after moving to the Arctic. They likely evolved this ability to assist them in a world that would otherwise be very bright and white. Under UV light, both food and predators stand out much more against the harsh snowy background.
Sloths don’t fall out of trees when they sleep because of how their claws evolved. Fortunately for many a sleeping sloth, their claws evolved quite the opposite of how ours did. While our hands are naturally open, and it takes force to clench them, this isn’t the case for sloths. Instead, their claws’ “relaxed” position is a tight grip, and it takes quite a lot of force for them to unclench their claws.
A dolphin’s blowhole is an evolved nose that has moved upward to the top of its head.
The Dollar Sign Was First Used in 1785: Here’s another fun money fact: The official adoption of the dollar sign in the U.S. can be traced back to 1785, when it evolved from the Spanish symbol for pesos. It’s believed the $ originated from the abbreviation PS, which was used to indicate Spanish pesos in the Americas. Gradually the “S” came to be written over the “P,” eventually morphing into the dollar sign we know today.
The concept of money in the UK has evolved from commodity money, such as precious metals and livestock, to representative money like banknotes and coins, and now to digital money, such as online banking and cryptocurrency.