You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
NYC's Metropolitan Transit Authority (MTA) dumps old subway cars into the ocean to serve as artificial reef.
8
‘Tree shaping’ is the art of growing trees and roots into things like bridges, chairs, “people trees”, ladders, fences, jungle gyms, tunnels, and, theoretically, could even be used to grow homes.
3
Caffeine boosts memory.
405
It is estimated that millions of trees in the world are accidentally planted by squirrels who bury nuts and then forget where they hid them!
174
New York's Central Park is nearly twice the size of the entire country of Monaco.
42
Fine-grained volcanic ash can be found as an ingredient in some toothpastes.
55
If you get water flowing fast enough, it can cut metal.
354