"This experiment is named after Rene Descartes (1596-1650), a French scientist and mathematician who used the diver to demonstrate gas laws and buoyancy.
Squeezing the bottle causes the diver to sink because the increased pressure forces water up into the diver, compressing the air at the top of the eyedropper. This increases the mass, and density, of the diver causing it to sink. Releasing the squeeze decreases the pressure on the air at the top of the eyedropper, and the water is forced back out of the diver." - Steve Spangler Science
Challenge: Post a comment explaining how the Cartesian diver works in your own words.
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