Back in the stone age, hail and pebble snow were all kids had to play with on snow days. The finer, more powdery forms of snow we’re used to today weren’t invented until the bronze age.

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Metafilter tags: Megastructure, StoneAge
Author: chariot pulled by cassowaries

Stone age wall found at bottom of Baltic Sea may be Europe's oldest megastructure. They think it may have been used to help hunt reindeer.