Listener Letters: Ghost Bikes, Butterflies03:25
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We heard from listeners after our recent stories on ghost bikescycling safety and the epic journey of Monarch butterflies. And we pause for a grammar lesson: less vs. fewer.

We also got a video and photos from a listener in response to our story on making shoes with a 3D printer. His 19th century typecasting machine is like a 3D printer, and it still works.

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This segment aired on October 12, 2012.

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