Go to Brilliant.org/SciShow to try out Brilliant’s Daily Challenges. Sign up now and get 20% off an annual Premium subscription. Did you know that last year we had 28 of the fastest days ever recorded? Earth's rotation can be affected by a number of things, and scientists think we might someday need an unprecedented adjustment: deleting a second! 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: Silas Emrys, Drew Hart, Jeffrey Mckishen, James Knight, Christoph Schwanke, Jacob, Matt Curls, Christopher R Boucher, Eric Jensen, Adam Brainard, Nazara Growing Violet, Ash, Laura Sanborn, Sam Lutfi, Piya Shedden, Katie Marie Magnone, Scott Satovsky Jr, 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: www.timeanddate.com/time/earth-faster-rotation.html www.nist.gov/pml/time-and-frequency-division/leap-seconds-faqs royalsocietypublishing.org/doi/10.1098/rspa.2016.0404 www.pmel.noaa.gov/elNino/faq link.springer.com/article/10.1007/s00190-010-0416-0 itunews.itu.int/en/NotePrint.aspx?Note=4268 www.itu.int/en/ITU-R/Documents/ITU-R-FAQ-UTC.pdf www.iers.org/IERS/EN/DataProducts/ICRF/ICRF/icrf.html agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2014GL059948 esd.copernicus.org/articles/8/1009/2017/esd-8-1009-2017.html www.bipm.org/utils/common/pdf/si-brochure/SI-Brochure-9-EN.pdf www.astronomy.ohio-state.edu/~pogge/Ast161/Unit4/tides.html www.nationalgeographic.com/science/article/120222-earth-spin-faster-time-oceans-el-nino-science Image Sources: earthobservatory.nasa.gov/features/ElNino commons.wikimedia.org/wiki/File:Usno-mc.jpg commons.wikimedia.org/wiki/File:ENSO_-_El_Ni%C3%B1o.svg commons.wikimedia.org/wiki/File:ENSO_-_La_Ni%C3%B1a.svg

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