Because you will likely be fine if you fall out

Give or take a day or two.......


It's not really related, other than it rotates.
But it made me think of this....and it is worth watching,
Unicef Play Pump:
http://www.pbs.org/frontlineworld/stories/southernafrica904/video_index.html

edit:  2016 commentary  https://medium.com/the-development-set/the-reductive-seduction-of-other-people-s-problems-3c07b307732d#.yav4bsov0