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Astronomy for March: Spring equinox, moon in the Beehive Venus and Mercury can be seen near the western horizon that evening. At 8 p.m. March 18, place Venus in the center of the field of a pair of 7 x 50 binoculars.
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Upside-down light: Scientists invert optical waves Scientists in Spain have developed a new material, a so-called hyperbolic metasurface, that inverts light waves. The technology could give researchers more precise control of optical waves and could be incorporated into a variety of optical devices ...
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