Get a lifetime membership to Nebula here:
http://go.nebula.tv/lifetime?ref=real...

Watch this video adfree on Nebula: https://nebula.tv/videos/realscience...

Patreon: (  / realscience  )
Instagram: (  / stephaniesammann  )

Images Courtesy of Getty Images

Thanks to our Patreon Supporters:
Eric Ypsilantis
Robert Thompson
Keith Skipper

Credits:
Writer/Narrator: Stephanie Sammann
Writer: Lorraine Boissoneault
Editor: Dylan Hennessy (https://www.behance.net/dylanhennessy1)
Illustrator/Animator: Kirtan Patel (https://kpatart.com/illustrations)
Animator: Mike Ridolfi (https://www.moboxgraphics.com/)
Sound: Graham Haerther (https://haerther.net)
Thumbnail: Simon Buckmaster (  / forgottentowel  )
Producer: Brian McManus (watchnebula.com/realengineering)

REFERENCES
[1] https://en.wikipedia.org/wiki/Castle_...
[2] https://web.archive.org/web/201709121...
[3] https://www.osti.gov/opennet/servlets...
[4] https://stacks.stanford.edu/file/drui...
[5] https://www.osti.gov/opennet/servlets...
[6] https://www.commonsnews.org/issue/113...
[7] https://web.archive.org/web/201310291...
[8] https://royalsocietypublishing.org/do...
[9] https://inis.iaea.org/collection/NCLC...
[10] https://academic.oup.com/jhered/artic...
[11] https://royalsocietypublishing.org/do...
[12] https://onlinelibrary.wiley.com/doi/f...
[13] https://www.worldwildlife.org/stories...
[14] https://pubmed.ncbi.nlm.nih.gov/25852....
[15] https://scihub.ee/10.1016/j.envint.2...
[16] https://www.sciencedirect.com/science...
[17] https://aacrjournals.org/cancerres/ar...