Raindrops and snowflakes generally start to form around something else in the air, like a speck of dust, but sometimes that something else is bacteria. We're conducting a survey of our viewers! If you have time, please give us feedback: www.surveymonkey.com/r/SciShowSurvey2017 Hosted by: Hank Green ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Kelly Landrum Jones, Sam Lutfi, Kevin Knupp, Nicholas Smith, Inerri, D.A. Noe, alexander wadsworth, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Bella Nash, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick Merrithew, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali, Kevin Bealer, Philippe von Bergen, Chris Peters, Justin Lentz ---------- 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.nasa.gov/audience/forstudents/k-4/stories/nasa-knows/what-are-clouds-k4.html www.nature.com/news/2008/080228/full/news.2008.632.html science.sciencemag.org/content/319/5867/1214 www.bbc.com/news/science-environment-13523502 www.montana.edu/news/15232/rocky-mountain-storms-lead-to-new-findings-about-hailstones onlinelibrary.wiley.com/doi/10.1002/2014JD022004/abstract www.livescience.com/14299-bacteria-create-rain-snow-hail.html www.livescience.com/2333-earth-clouds-alive-bacteria.html onlinelibrary.wiley.com/doi/10.1111/gcb.12447/abstract www.sciencemag.org/news/2016/04/video-these-microbes-are-key-making-artificial-snow Images: www.thinkstockphotos.com/image/stock-photo-clouds-in-the-sky/128951584 en.wikipedia.org/wiki/File:Hagelkorn_mit_Anlagerungsschichten.jpg svs.gsfc.nasa.gov/11685 commons.wikimedia.org/wiki/File:Pseudomonas_syringae_cultures.jpg

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