After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
A human being loses an average of 40 to 100 strands of hair a day.
133
Enamel is hardest substance in the human body.
61
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Yawns are more contagious among people with closer relationships.
163
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Your thumb is about the same size as your nose.
124