Iron weighs more after it rusts.
68
Iron weighs more after it rusts.
16
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Hot water can freeze faster than cold water.
181
Sound travels about 4 times faster in water than in air.
408