Pumice is the only rock that floats on water.
14
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
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
Each day, up to 150 species of life become extinct.
-23
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
One ragweed plant can release as many as one billion grains of pollen!
51
A cesium atom in an atomic clock beats over nine billion times a second.
43