After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
The human sigh acts as a physiological reset button.
23
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
Enamel is hardest substance in the human body.
61
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
Our Right Lungs takes more air than our left lung.
194