The potato has been studied by NASA as an important source of food for long manned space missions. It was found that the number of potato plants needed to sustain one astronaut equaled the amount of potato plant required to process the air to breathe by one astronaut.

There are 5 temples in Kyoto, Japan that have blood stained ceilings. The ceilings are made from the floorboards of a castle where warriors killed themselves after a long hold-off against an army. To this day, you can still see the outlines and footprints.