Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
Nylon is made from coal and petroleum.
42
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
One 75-watt bulb gives more light than three 25-watt bulbs.
57
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9