Yawns are more contagious among people with closer relationships.
163
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Only humans shed emotional tears.
331
One human hair can support 3 ounces.
191
Tigers can see 6 times better at night than humans.
305
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34