Balsa wood is classified as a hard wood!
41
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
Iron weighs more after it rusts.
16
Sound travels fifteen times faster through steel than through air.
134
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
A cesium atom in an atomic clock beats over nine billion times a second.
43