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A rotating amusement park ride at dusk. Passengers on this ride experience a force about twice that of gravity. The force is due to the acceleration felt by the change in direction necessary to keep the passenger moving in a circle at a constant speed. The same force applies to satellites orbiting planets and planets orbiting the sun.
How thick is your brain?
The thickness of a brain's gray matter varies across the brain. Here it is color-coded, from red (thickest) to blue (thinnest). Made up of nerve cell bodies, gray matter is thickest in the frontal lobes of the brain, at the top. Researchers believe that the frontal lobes control languages, memory, judgment and social skills.
Molecules' orientation within a liquid crystal can be seen by viewing the crystals with polarized light. Regions that have the same color here have the same orientation.