Wilson Kipsang (IMAGE)
Caption
Thanks to biological lubrication natural joints move almost frictionless and withstand enormous loads.
Credit
Tom Page (<a target="_blank" href="https://www.flickr.com/photos/tompagenet/6957645328">https://www.flickr.com/photos/tompagenet/6957645328</a>, <a target="_blank" href="https://creativecommons.org/licenses/by-sa/2.0/deed.en">https://creativecommons.org/licenses/by-sa/2.0/deed.en</a>)
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CC BY-SA 2.0, <a target="_blank" href="https://creativecommons.org/licenses/by-sa/2.0/deed.en">https://creativecommons.org/licenses/by-sa/2.0/deed.en</a>
License
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