Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
Sound travels about 4 times faster in water than in air.
408
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
The average home creates more pollution than does the average car.
33
Iron weighs more after it rusts.
16
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Most dust particles in your house come from dead skin.
48