#1 By: Maggie Koerth-Baker, August 8th, 2013 13:02
#2 By: Walter Guyll, August 8th, 2013 13:53
Dirt in my neighborhood of Puget Sound, scoured to the bedrock by the last glaciation, is less than 15,000 years old.
#3 By: Christopher Waldrop, August 8th, 2013 14:06
A co-worker of mine commonly uses the expression "since dirt was clean". I'm guessing that would predate the appearance of life on Earth, which would be pretty old.
#4 By: Maggie Koerth-Baker, August 13th, 2013 13:03
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