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July 2, 2014

 

A cluster of mailboxes

The Chain Letter’s Exponential Growth

If people actually followed the instructions on chain letters they received, it wouldn't be long before everyone in the world had a letter in their mailbox.

September 27, 2003

 

There’s Moss on the North Side

If you live in the middle latitudes of the northern hemisphere, the moss will grow thicker on the north side. It may sound like an urban legend, but it’s quite real. And the reason is simple: there’s more sun on one side.

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