26:06Learning
From the PhD Lab: How do biofilms help keep bacteria alive? - with Josh Horton
The Royal Institution
People began riding horses thousands of years ago. Saddles for horseback riding were invented soon after. Today, many companies manufacture saddles. But it is rare to find someone who designs and makes these products by hand. Originally published at - http://learningenglish.voanews.com/media/video/2688609.html
Published 2015-03-20 · Watch on YouTube ↗
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