It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
A human being loses an average of 40 to 100 strands of hair a day.
133
It takes approximately 12 hours for food to entirely digest.
93
A man's beard grows fastest when he anticipates sex.
239
Human hair and fingernails continue to grow after death.
7
We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
26
Only humans shed emotional tears.
331
Research has determined that most people are happiest at 7:26pm on a Saturday night.
70