6. THE BRAIN IS MORE ACTIVE AT NIGHT THAN DURING THE DAY. SCIENTISTS DON’T KNOW YET WHY THIS IS.

Logically, you would think that all the moving around, complicated calculations and tasks and general interaction we do on a daily basis during our working hours would take a lot more “brain power” than, say, lying in bed. Turns out, the opposite is true. When you turn off your brain turns on. Scientists don’t yet know why this is but you can thank the hard work of your brain while you sleep for all those pleasant dreams.

7. 15% OF POPULATION DON’T HAVE THIS TENDON IN THEIR ARM.

The palmaris longus is a muscle of forearm that spans from your elbow into your inner hand. According to the various anatomy references, the palmaris longus muscle is not present in approximately 10-15% of the population, with a few studies pointing to a greater variance of people that have the muscle and tendon in one arm, but not the other.

8. WHY YOU WAKE UP WITH MORNING ERECTIONS

Men have erections every hour to hour and a half during sleep. This is because the combination of blood circulation and testosterone production can cause erections during sleep and are a necessary part of REM sleep. They happen sporadically throughout the night, so whether you wake up with one or not is just up to chance.

ARE YOU AN INNIE OR AN OUTIE BELLY BUTTON? HERE’S WHAT IT MEANS.

Belly buttons come in all shapes and sizes and everyone has one, but they are mostly categorized by either being an ‘innie’ or an ‘outie.’

When you were born, the doctor tied off or clamped the umbilical cord, so that it could be cut off where it attached to your belly. Over the first few weeks of your life, what was left of the umbilical cord slowly dried up and fell off. What was left? Your belly button! Whether you end up with an innie or an outie is usually a matter of chance. Most people end up with innies, but some people have outies. Outies usually occur when more of the umbilical cord is left when it’s cut, leading to more skin left over once it dries out.

Are there any amazing facts about the human body that you’ve discovered? Please share it with your friends.

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