Would you let a leech feed on your arm for science? 🩸 Entomologist Tim Cockerill did just that. He knew leeches have around 300 teeth...and still did it. If that isn't commitment to science! Subscribe for regular science videos: http://bit.ly/RiSubscRibe The Ri is a science charity. Support us in creating more accessible science content by becoming a member and unlock exclusive content and perks. https://www.youtube.com/channel/UCYeF244yNGuFefuFKqxIAXw/join #leech #biology #scienceexplained #naturescience #bloodletting #historyscience #sciencefact #funscience #demonstration #educational

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