The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
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
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Pure water (H2O) does not conduct electricity on its own.
46
Indoor pollution is 10 times more toxic than outdoor pollution.
62