Spiral shark intestines work like Nikola Tesla’s water valve, study finds

Enlarge / A CT scan image of the spiral intestine of a Pacific spiny dogfish shark (Squalus suckleyi). The beginning of the intestine is on the left, and the end is on the right. (credit: Samantha Leigh/California State University, Dominguez Hills) In 1920, Serbian-born inventor Nikola Tesla designed and patented what he called a “valvular […]