The Earth's atmosphere is made up of 78% nitrogen, 21% oxygen, and trace amounts of other gases, including carbon dioxide and water vapor.
The Earth's surface is made up of 70% water and 30% land.
The human body is made up of about 60% water.
The average person takes about 20,000 breaths per day.
The average person's heart beats about 100,000 times per day.
The average person's skin renews itself about every 27 days.
The average person's hair grows about half an inch per month.
The Earth's gravity is what keeps all of the planets in orbit around the sun.
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