Little progress had been made in solving Ramsey problems since the 1930s. Now, researchers have found the answer to r(4,t), a longstanding Ramsey problem that has perplexed the math world for decades.

These are math’s most famous open questions. Solve one, and you’ll win a $1-million prize—but it’s only happened once since ...

Scratch donut-making is on the rise in home kitchens, driven by a generation of bakers who want the real thing and know that ...