- 1 square inch of human skin contains 625 sweat glands.
- Moths have white blood.
- The number Pi (the ratio of the circumference to the diameter of a circle) can't be expressed as a fraction, making it an irrational number. It never repeats and never ends when written as a decimal..
- Niagara Falls could fill 4,000 bathtubs every second.
- Humans are the only primates that don't have pigment in the palms of their hands.
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