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1902 in science
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==Physics== * [[Oliver Heaviside]] and [[Arthur E. Kennelly]] independently predict the existence of what will become known as the [[Kennelly-Heaviside Layer]] of the [[ionosphere]]. * [[James Jeans]] finds the length scale required for gravitational perturbations to grow in a static nearly homogeneous medium. * [[Philipp Lenard]] observes that maximum [[Photoelectric effect|photoelectron]] energies are independent of illuminating intensity but depend on frequency. * [[Gilbert N. Lewis]] develops the [[cubical atom]] atomic model. * [[Theodor Svedberg]] suggests that fluctuations in molecular bombardment cause the [[Brownian motion]].
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