Scientists aren't sure what color dinosaurs were.
312
In zero gravity, a candle's flame is round and blue.
16
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Pure water (H2O) does not conduct electricity on its own.
46
Indoor pollution is 10 times more toxic than outdoor pollution.
62
One 75-watt bulb gives more light than three 25-watt bulbs.
57
One barrel of petroleum holds 42 gallons.
20