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Learn about the medical history of using leeches; potty training cows to help the environment; and the math behind eggs. More from zoologist Bill Schutt:  Pick up "Pump: A Natural History of the Heart" https://www.workman.com/products/pump  Website: https://billschutt.com/  Follow @BillSchuttBooks on Twitter: https://twitter.com/BillSchuttBooks Facebook: https://www.facebook.com/BillSchutt1/  Potty training cows can help the environment by Steffie Drucker  BORENSTEIN, S. (2021, September 13). No bull: Scientists potty train cows to use “MooLoo.” ABC News; ABC News. https://abcnews.go.com/Weird/wireStory/bull-scientists-potty-train-cows-mooloo-79991165   Dirksen, N., Langbein, J., Schrader, L., Puppe, B., Elliffe, D., Siebert, K., Röttgen, V., & Matthews, L. (2021). Learned control of urinary reflexes in cattle to help reduce greenhouse gas emissions. Current Biology, 31(17), R1033–R1034. https://doi.org/10.1016/j.cub.2021.07.011  Researchers are toilet-training cows to reduce ammonia emissions caused by their waste. (2021, September 13). EurekAlert! https://www.eurekalert.org/news-releases/927878  Scientists have uncovered the mathematical formula for the shape of an egg by Briana Brownell  Research finally reveals ancient universal equation for the shape of an egg. (2021, August 31). News Centre - University of Kent. https://www.kent.ac.uk/news/science/29620/research-finally-reveals-ancient-universal-equation-for-the-shape-of-an-egg  Narushin, V. G., Romanov, M. N., & Griffin, D. K. (2021). Egg and math: introducing a universal formula for egg shape. Annals of the New York Academy of Sciences. https://doi.org/10.1111/nyas.14680   Who Laid The First Egg? Scientists Move A Step Closer To Linking Embryos Of Earth’s First Animals To Adult Form. (2021). ScienceDaily. https://www.sciencedaily.com/releases/2004/11/041104005307.htm   Follow Curiosity Daily on your favorite podcast app to learn something new every day withCody Gough andAshley Hamer. Still curious? Get exclusive science shows, nature documentaries, and more real-life entertainment on discovery+! Go to https://discoveryplus.com/curiosity to start your 7-day free trial. discovery+ is currently only available for US subscribers. See omnystudio.com/listener for privacy information.