Pumice is the only rock that floats on water.
14
Scientists aren't sure what color dinosaurs were.
312
Nearly 50% of the world's scientists are assigned to military projects.
71
The only letter not appearing on the Periodic Table is the letter "J".
180
Sound at the right vibration can bore holes through a solid object.
134
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108