Balsa wood is classified as a hard wood!
41
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Nylon is made from coal and petroleum.
42
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
Cold water weighs more than hot water.
93
Sound travels about 4 times faster in water than in air.
408
Each day, up to 150 species of life become extinct.
-23
No matter how cold it gets, gasoline will not freeze.
107