Balsa wood is classified as a hard wood!
41
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
A ball of glass will bounce higher than a ball made of rubber.
73
Sound travels about 4 times faster in water than in air.
408
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Diamonds can be shattered with a hammer.
-104
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310