Most dust particles in your house come from dead skin.
48
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Indoor pollution is 10 times more toxic than outdoor pollution.
62
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
German chemists made a replica of a trophy the size of one molecule.
68