Tammy Awtry
All Stories by Tammy Awtry
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Brain
Purple exists only in our brains
Most colors represent a single wavelength of light. But your brain invents purple to deal with wavelengths from opposite ends of the visible spectrum.
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Space
Here’s why the moon must get its own time zone
But should moon time be like Earth time — or quite different? At issue: The moon’s lesser gravity will make seconds there tick faster than on Earth.