Encyclopedia Blog For Kid's Research about Science, Technology and Discoveries
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Atomic clock, electric or electronic timekeeping device that is controlled by atomic or molecular oscillations. A timekeeping device must co...
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. Vacuum Tubes, electronic devices, consisting of a glass or steel vacuum envelope and two or more electrodes between which electrons can mo...
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. Evolution, in biology, complex process by which the characteristics of living organisms change over many generations as traits are passed ...