It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
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
We share 70% of our DNA with a slug.
218
You can't tickle yourself.
29
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69