Matt Kieffer/Flickr CC
Skeezix1000 at English Wikipedia. [Public domain], via Wikimedia Commons
Nephron, via Wikimedia Commons
John Davies [GFDL 1.2 (http://www.gnu.org/licenses/old-licenses/fdl-1.2.html) or GFDL 1.2 (http://www.gnu.org/licenses/old-licenses/fdl-1.2.html)]
John Davies [GFDL 1.2 (http://www.gnu.org/licenses/old-licenses/fdl-1.2.html) or GFDL 1.2 (http://www.gnu.org/licenses/old-licenses/fdl-1.2.html)]
Toopure72/YouTube
Toopure72/YouTube
Jamie/Flickr CC
Mike Kalasnik/Flickr CC
Martin Good/Shutterstock
Nisargmediaproductions/Shutterstock
Canada Science and Technology Museum/Flickr CC
Canada Science and Technology Museum/Flickr CC
Jamie/Flickr CC
J2rome at the English language Wikipedia [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/)]
Konstantin von Wedelstaedt [GFDL 1.2 (http://www.gnu.org/licenses/old-licenses/fdl-1.2.html) or GFDL 1.2 (http://www.gnu.org/licenses/old-licenses/fdl-1.2.html)]
J.P. Moczulski/AFP/Getty
Sonic More Music/YouTube
Solmaz A/Flickr CC
Matt Kieffer/Flickr CC
Paul McKinnon/Shutterstock
Joe+Jeanette Archie [CC BY 2.0 (https://creativecommons.org/licenses/by/2.0)]
Giftography/Shutterstock
RuthAS [CC BY 3.0 (https://creativecommons.org/licenses/by/3.0)]
Don MacKinnon/Getty
Raysonho@Open Grid Scheduler/Grid Engine [CC0], via Wikimedia Commons
Jeangagnon [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)]
Martin Good/Shutterstock
Jamie McCaffrey/Flickr CC
Erik S. Lesser/Getty
Bertrand Guay/AFP/Getty
08 April 2019
Daniel Coughlin
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