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Some of the investigations into the subject of light have produced complex theories and conclusions, as demonstrated in Lightly Story: Light Pressure for Some Heavy Ideas. Many of the best minds in science have grappled with the intricate nature of light, including Max Planck and Albert Einstein. Lightly Story: Light Pressure for Some Heavy Ideas looks at the Michaelson-Morley experiment performed in the 19th century, which compared the velocity of light at different angles, and Planck's theory of light as packets of energy, or quanta. Planck's work led to Einstein's conclusions of the photoelectric effect.