If you know one of the many people who are immediately and always deeply fascinated by all things Tesla, make sure your acquaintance is familiar with the shark spiral intestines Tesla valve research study. That study is:
“Shark Spiral Intestines May Operate as Tesla Valves,” Samantha C. Leigh, Adam P. Summers, Sarah L. Hoffmann, and Donovan P. German, Proceedings of the Royal Society B, vol. 288, no. 1955, 2021, article 20211359.
Here is further, visual detail from that study:
