For those of a certain age, Coneheads is an iconic 90s film. But for breakdancers, it seems, developing a cone-shaped head ...
Breakdancers have been urged to avoid headspinning after a dancer who developed a cone-shaped lump on his head due to "years of extensive headspinning practice” had to have it surgically removed.
A cone-shaped portion of spacetime containing all (past) locations from which light could arrive at a particular location within spacetime (the tip of the cone). The tip can be reached from points ...