Your fingernails grow faster in summer.
744
The human brain doesn't stop developing until about 25 years old.
102
The human brain is more active during sleep than during the day.
28
Your thumb is about the same size as your nose.
124
The human eye blinks an average of 4,200,000 times a year.
233
Obsessive nose picking is called Rhinotillexomania.
101
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The average sperm cell swims at 8 inches per hour.
4