The full moon causes a tidal wave to roll up the Amazon river once in day and once in night for a period of only three weeks in a year. This results in continuous 4m high wave that can be surfed for up to 13km.
14
In Georgia, there is an airtight room called the Crypt of Civilization that was sealed in 1940. It contains numerous artefacts documenting what life was like at the time of sealing, and is scheduled to be opened in the year 8113 to show people of the future exactly what life was like.
13
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
Fine-grained volcanic ash can be found as an ingredient in some toothpastes.
55
By raising your legs slowly and laying on your back, you can't sink in quicksand.
105
There was once an undersea post office in the Bahamas.
241
Water is actually naturally blue.
48