Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
The sun is 330,330 times larger than the earth.
75
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
One cubic foot of gold weighs more than 1,200 pounds!
78
One third of the electricity produced on earth is used to power electric light bulbs!
75
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79