On: A physicist rigged his pet hamster’s wheel to upload to Strava

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That's awfully European of you, what if the mice are from the US?

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US runners also typically train for kilometer races at distances shorter than half marathon.

I've even seen a few 50Ks.

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Means the same thing here.

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“I ran a 3.1mi this morning and I feel awful!”

No, distance events are still referred in kilometers in the US.