/u/Dbgb4's posts in /r/askscience
When light goes from a vacuum, into water, then back to a vacuum. At what speed is it now traveling ?
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Is the plane of the Suns orbit around the galactic center the same as the plane of the planets orbit around the Sun ? If so when in the cycle of the earths orbit are we in the front of the Sun's path.
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In the Re-Wilding efforts I see in many places now could Elephants be used in place of the extinct mammoths ?
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