The sharpest children in the world underwater are Moken

Did you know that children of the Moken tribe see better than others underwater?
The discovery dates back to 1999, when a group of Swedish researchers realized that the members of this semi-nomadic tribe of Southeast Asia (Andaman Archipelago and the west coast of Thailand) were able to collect shells, molluscs and sea cucumbers even at 23 meters depth, because they had a sharper than normal underwater vision. This particular super power is due to the ability of their eyes to tighten the pupil up to 1.96 mm in diameter, when the others reach an average of 2.5 mm.
The researchers found that this is not a genetic feature, because in adult Moken the exceptional ability to see things twice more clearly underwater unfortunately tends to disappear completely.