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Far-Traveling Objects

What If?
Far-Traveling Objects

Which human-made object has travelled the farthest distance? There are several answers to this, none of which is a spacecraft, but one is: a stone from Ethiopia.

From Weekly Filet #153, in August 2014.

๐Ÿ’” Some older links might be broken โ€” that's the state of the web, sadly. If you find one, ping me.