One 75-watt bulb gives more light than three 25-watt bulbs.
57
No matter how cold it gets, gasoline will not freeze.
107
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
One barrel of petroleum holds 42 gallons.
20
The bark of an older redwood tree is fireproof.
65
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
One cubic foot of gold weighs more than 1,200 pounds!
78
