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
Out of all the senses, smell is most closely linked to memory.
146
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
Sound travels fifteen times faster through steel than through air.
134
One cubic foot of gold weighs more than 1,200 pounds!
78
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
One 75-watt bulb gives more light than three 25-watt bulbs.
57