Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Nearly 50% of the world's scientists are assigned to military projects.
71
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Hot water can freeze faster than cold water.
181
The sun is 330,330 times larger than the earth.
75