Iron weighs more after it rusts.
68
Scientists aren't sure what color dinosaurs were.
312
Sound travels fifteen times faster through steel than through air.
134
One cubic foot of gold weighs more than 1,200 pounds!
78
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13
A cubic yard of air weighs about 2 pounds at sea level.
31
Balsa wood is classified as a hard wood!
41
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3