One 75-watt bulb gives more light than three 25-watt bulbs.
57
Indoor pollution is 10 times more toxic than outdoor pollution.
62
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
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
Sound at the right vibration can bore holes through a solid object.
134
Pure water (H2O) does not conduct electricity on its own.
46
Iron weighs more after it rusts.
16