Go to Brilliant.org/SciShow to try out Brilliant’s Daily Challenges. The first 200 subscribers get 20% off an annual Premium subscription. The Atlantic Ocean is the second largest on Earth, and yet there are no sea snake populations to be found there. What’s keeping aquatic serpents from making a home in these waters? 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: Adam Brainard, Greg, Alex Hackman, Sam Lutfi, D.A. Noe, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters ---------- 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: academic.oup.com/bioscience/article/68/1/15/4609687 journals.plos.org/plosone/article?id=10.1371/journal.pone.0212099 onlinelibrary.wiley.com/doi/10.1111/jbi.12636 earthobservatory.nasa.gov/images/4073/panama-isthmus-that-changed-the-world onlinelibrary.wiley.com/doi/abs/10.1111/aec.12717 www.sciencedaily.com/releases/2019/04/190402113126.htm ---------- Images: en.wikipedia.org/wiki/File:Pelamis_platuras.jpg commons.wikimedia.org/wiki/File:Panama_Canal_Gatun_Locks.jpg commons.wikimedia.org/wiki/File:Cuidaddepanama1.jpg commons.wikimedia.org/wiki/File:Fish3217_-_Flickr_-_NOAA_Photo_Library.jpg

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