A real estate agent's rule of thumb: To estimate what a house will sell for, ask the owner what its worth and subtract 10%.
24
The face of a penny can hold about thirty drops of water.
85
Sunflowers can be used to clean up radioactive waste.
17
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
The Main Library at Indiana University sinks over an inch every year because when it was built, engineers failed to take into account the weight of all the books that would occupy the building.
240
Déjà vu occurs when your brain tries to apply a memory of a past situation to your current one, fails, and makes you feel like it's happened.
12