In this extraordinary adaptation strategy, Thailand’s Moken sea gypsies can see twice as clearly underwater by controlling the size of their pupils. What was generally considered an automatic reflex for the rest of us is now thought to be something that any child under 5 could learn how to do.
From a study called Superior Underwater Vision in a Human Population of Sea Gypsies by Dr. Anna Gislén:
The Moken may learn to do this due to their extensive use of their eyes in water, where accommodation and concurrent pupil constriction is necessary for them to see the items they gather for food. It should then be possible for all humans to learn to see better underwater. But because sea gypsies have lived by and off the sea for thousands of years, evolution may also have favored those who had intrinsically better underwater accommodative powers. The ability to see well underwater could have become a genetic trait. Another possible explanation is that accommodation underwater is a side effect of the diving response; the parasympathetic nerves that control this reflex also control pupil constriction.
Manuel Balce Ceneta / AP
(via Washington Post)
Three-month-old Sumatran tiger cub Bandar shows his displeasure after being dunked in the tiger exhibit moat for a swimming test at the National Zoo on Nov. 6. All cubs born at the zoo must take a swim test before being allowed to roam in the exhibit. Bandar passed the test.
(Source: Washington Post)
Oystermen by Marco Casagrande
A public environmental installation of four sand-blasted stainless steel figures of men located on a tidal shore by Kinmen Island, Taiwan. Each is fitted with a solar energy collecting conical Asian hat that illuminates the seascape at night.