This episode is sponsored by Awesome Socks Club, a sock subscription for charity. Go to awesomesocks.club/SciShow to sign up between now and December 11th to get a new pair of fun socks each month in 2021. 100% of after-tax profit will go to decrease maternal and child mortality in Sierra Leone, which is one of the most dangerous places to be pregnant in the world. It's really difficult for life to create blue pigments, but the color can appear in a handful of compounds that create just the right conditions to reflect blue photons. Hosted by: Hank Green SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Jb Taishoff, Bd_Tmprd, Harrison Mills, Jeffrey Mckishen, James Knight, Christoph Schwanke, Jacob, Matt Curls, Sam Buck, Christopher R Boucher, Eric Jensen, Lehel Kovacs, Adam Brainard, Greg, Ash, Sam Lutfi, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, charles george, Alex Hackman, Chris Peters, Kevin Bealer ---------- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Instagram: instagram.com/thescishow ---------- Sources: doi.org/10.1093/mollus/eyi062 doi.org/10.1126/sciadv.aaz0421 doi.org/10.1186/s12864-019-5436-4 doi.org/10.1103/PhysRevE.90.062302 doi.org/10.1007/s00217-013-1932-y doi.org/10.1111/j.1365-313X.2008.03447.x pubmed.ncbi.nlm.nih.gov/11803417/ doi.org/10.1039/B800165K doi.org/10.1074/jbc.M314251200 doi.org/10.1074/jbc.C400337200 doi.org/10.1086/692661 pubmed.ncbi.nlm.nih.gov/22438844/ pubmed.ncbi.nlm.nih.gov/22811668/ pubmed.ncbi.nlm.nih.gov/28157151/ pubmed.ncbi.nlm.nih.gov/28533449/ doi.org/10.1021/bk-2013-1138.ch008 doi.org/10.5772/32410 doi.org/10.1021/bk-2013-1138.ch008 doi.org/10.1021/jf501419q doi.org/10.1016/0305-0491(84)90283-9 doi.org/10.1016/j.freeradbiomed.2017.11.020 doi.org/10.1126/science.364.6439.424 doi.org/10.1111/jzo.12001 www.npr.org/sections/health-shots/2014/11/12/347736896/how-animals-hacked-the-rainbow-and-got-stumped-on-blue Image Sources: bit.ly/33dn4mv bit.ly/35ZGpZY bit.ly/3pXTI5g bit.ly/2J9ZbVs bit.ly/39biyIK bit.ly/3pXDOaS bit.ly/3fsKrNK bit.ly/36037Ba bit.ly/3pVTbAF bit.ly/3l3h5H1 bit.ly/2J9HZQl bit.ly/2UVpscS bit.ly/39gu1H4 bit.ly/35ZLrpu bit.ly/35YBLeS bit.ly/3fujmJY bit.ly/3pYyFPV bit.ly/33bhuAL bit.ly/33ey02W bit.ly/2V2boy8 bit.ly/3pYyQL5 bit.ly/33h2UYD bit.ly/3fvwfU8 bit.ly/3m80Aus bit.ly/2HwUiFC bit.ly/3fDBOjy

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