Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
The only letter not appearing on the Periodic Table is the letter "J".
180
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
No matter how cold it gets, gasoline will not freeze.
107
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Indoor pollution is 10 times more toxic than outdoor pollution.
62