Texas joined the United States in 1845, and American interest in the Panhandle increased. The Red River War (1874–1875) ...

Penrose’s optical illusion of an “impossible triangle”, inspired by a visit ... boy fascinated by a sundial’s shadow, twisting the shape of spacetime just to see what would happen if ...

A geometry problem over a century old has just found its definitive answer. Mathematicians have confirmed that the solution ...

Now, more than 122 years after it was first proposed, Kamata and two other mathematicians have finally proved that a solution ...