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From Popular Science: The newest addition to human anatomy is just 15 microns thick, but its discovery will make eye surgery safer and simpler. Harminder Dua, a professor at the University of Nottingham, recently found a new layer in the human cornea, and he’s calling it (can you guess?) Dua’s layer. Dua’s layer sits at the back of the cornea, which previously had only five known layers. Dua and his colleagues discovered the new body part by injecting air into the corneas of eyes that had been donated for research and using an electron microscope to scan each separated layer.

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