In zero gravity, a candle's flame is round and blue.
16
Pure water (H2O) does not conduct electricity on its own.
46
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Out of all the senses, smell is most closely linked to memory.
146
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79