3D shapes have faces (sides), edges and vertices (corners). Faces - A face is a flat or curved surface on a 3D shape. For example a cube has six faces, a cylinder has three and a sphere has just one.

In 1871, the mathematician Lord Kelvin invented a shape called an isotropic helicoid that physicists predicted would behave strangely in a fluid – now it has been tested for the first time ...

A 150-year-old theory about an otherworldly shape proposed by Lord Kelvin, one of history's greatest physicists, has finally been put to the test — and his conjecture is now in doubt.