The electromagnetic spectrum, with wavelengths, frequencies, energies, temperatures and names
Moving masses generate waves of gravitational radiation that stretch and squeeze space-time. <a href="http://www.space.com/25089-how-gravitational-waves-work-infographic.html">See how gravitational waves work in this Space.com infographic</a>.
The upper and lower case Greek alphabet. A must know for any mathematician or physicist.
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