A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
The human eye blinks an average of 4,200,000 times a year.
233
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
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
The average sperm cell swims at 8 inches per hour.
4
The human brain doesn't stop developing until about 25 years old.
102