maggiekb — 2013-08-08T13:02:52-04:00 — #1
walter_guyll — 2013-08-08T13:53:45-04:00 — #2
Dirt in my neighborhood of Puget Sound, scoured to the bedrock by the last glaciation, is less than 15,000 years old.
spunkytws — 2013-08-08T14:06:11-04:00 — #3
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.
maggiekb — 2013-08-13T13:03:04-04:00 — #4
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