Between 30,000 and 40,000 skin cells fall off you every minute as new cells grow and take their place. Your outer skin layer will be completely replaced by new cells in one to two months.
The human sneeze can travel faster than 100 miles per hour (160 km/h). It is not recommended to hold back a sneeze, as the extreme pressure may cause ear damage.
Research has shown that frequently cracking your knuckles increases your chance of hand swelling and lowered grip strength.
It's a common belief that humans use only 10 percent of their brains. MRI imaging has shown that humans actually use most of their brain, even while sleeping.
The average resting adult consumes about the same amount of energy as a 100 watt light bulb; that's more than 600 AA batteries per day.