Walk through any village or scroll past historic photos, and you will notice the same pattern: hand-dug wells are almost always perfect circles. The shape shows up in Bronze-Age stepwells in India, ...

The United States once poured money and political capital into a spaceplane concept that promised to take off from a runway, ...

If you're a soccer fan, you're familiar with this common sight: A penalty kick is in place, with a "wall" of defenders lined ...

Producing fusion energy requires heating plasma to more than one hundred million degrees and confining it stably with strong ...