The organ of corti, which focuses each frequency of sound on a different set of hair cells.
Hair cells of the inner ear.
In the 21st century, we operate robots on Mars.
Go back in time and show this to Jules Verne.
The Richat Structure in northwest Africa is a symmetrical anticline. Layers rock from the Paleozoic era have been folded during continental drift, and a corner of the fold has pierced through the surface.
Schiaparelli crater on Mars.
viscous velocity vortex.