Unique 3D printed shape shakes up Lord Kelvin’s 150-year-old math theory

Researchers at Wesleyan University have used 3D printing to reassess a long-standing theory proposed by British mathematician Lord Kelvin 150 years ago.  In essence, Kelvin predicted that a sphere shape with vanes known as an ‘isotropic helicoid’ would behave unusually if submersed in fluid, appearing to be the same from any angle while ‘naturally’ spinning. […]