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You are browsing the archive for 2017 December 21.

21 December 2017

Rare Cloud Display Across Ohio and Indiana Thursday

You see those strange holes in the clouds across Indiana and Ohio? These are fallstreak holes or “hole punch” clouds, and they happen when aircraft fly through clouds of supercooled water. These clouds are well below 0° C, but the cloud droplets are still liquid (water will not always freeze into crystals of ice until the temperature reaches about -40° F/-40° C). If a few ice crystals are introduced, then a rapid …

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The Cosmos Lost Carl Sagan 21 Years Ago Today

His books live on. They inspire new generations of scientists and will for decades to come. If you have not read Demon-Haunted World, then buy it. Buy two more copies and give them to a smart young student for Christmas. Just doing that may change their world. It just might change everyone’s world.

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