On average, there's 100 billion neurons in the human brain.
83
Yawns are more contagious among people with closer relationships.
163
Your thumb is about the same size as your nose.
124
Tigers can see 6 times better at night than humans.
305
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
Our brains have a negativity bias and will remember bad memories more than good ones.
15