Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Sound travels fifteen times faster through steel than through air.
134
One third of the electricity produced on earth is used to power electric light bulbs!
75
Pure water (H2O) does not conduct electricity on its own.
46
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
According to studies, men change their minds two to three times more often than women.
72
The force of a suction cup is calculated using F=AP.
15