When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
30
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Poor eyesight (myopia) is associated with higher IQ.
232
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 twice as long to lose new muscle if you stop working out than it did to gain it.
127