Captions provided by CCTubes – Captioning the Internet! 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.
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Sources:
https://www.nasa.gov/audience/forstudents/k-4/stories/nasa-knows/what-are-clouds-k4.html
http://www.nature.com/news/2008/080228/full/news.2008.632.html
http://science.sciencemag.org/content/319/5867/1214
http://www.bbc.com/news/science-environment-13523502
http://www.montana.edu/news/15232/rocky-mountain-storms-lead-to-new-findings-about-hailstones
http://onlinelibrary.wiley.com/doi/10.1002/2014JD022004/abstract
https://www.livescience.com/14299-bacteria-create-rain-snow-hail.html
https://www.livescience.com/2333-earth-clouds-alive-bacteria.html
http://onlinelibrary.wiley.com/doi/10.1111/gcb.12447/abstract
http://www.sciencemag.org/news/2016/04/video-these-microbes-are-key-making-artificial-snow
Images:
http://www.thinkstockphotos.com/image/stock-photo-clouds-in-the-sky/128951584
https://en.wikipedia.org/wiki/File:Hagelkorn_mit_Anlagerungsschichten.jpg
https://svs.gsfc.nasa.gov/11685
https://commons.wikimedia.org/wiki/File:Pseudomonas_syringae_cultures.jpg
