Hydras: Our Immortal, Tentacled Friends

While humans age and die (which is kind of a bummer), it looks like hydras will stay young and fertile forever. Why is this? And what can we learn from these tentacular microscopic organisms?

Hosted by: Hank Green
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REFERENCES
http://www.eurekalert.org/jrnls/pnas/pdfs/pnas.201521002.pdf
http://www.eurekalert.org/jrnls/pnas/si/pnas.201521002SI.pdf
http://www.britannica.com/animal/Hydra-hydrozoan-genus
http://www.els.net/WileyCDA/ElsArticle/refId-a0001096.html
http://www.sciencedaily.com/releases/2010/03/100314150922.htm

IMAGE/VIDEO SOURCES
https://commons.wikimedia.org/wiki/File:Hydravulgaris.jpg
https://commons.wikimedia.org/wiki/File:Lernaean_Hydra_Getty_Villa_83.AE.346.jpg