Iron weighs more after it rusts.
68
In zero gravity, a candle's flame is round and blue.
16
A cubic yard of air weighs about 2 pounds at sea level.
31
Nearly 50% of the world's scientists are assigned to military projects.
71
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Sound at the right vibration can bore holes through a solid object.
134
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
One cubic foot of gold weighs more than 1,200 pounds!
78