Hannah Cairo found herself stuck on a problem that wouldn’t leave her mind. It wasn’t a regular homework assignment—it was a decades-old mathematical puzzle believed to be true by leading experts in ...

Test your knowledge of taxicab geometry, triangular numbers, the golden ratio and more.

Imidacloprid has become a research hotspot, due to its high toxicity to bees and other nontarget organisms. Photodegradation is a common method for removing imidacloprid in an aquatic environment.

Julia Roberts Shares New Photo From Life With Danny Moder for Anniversary João Pedro scores twice vs. boyhood team, Chelsea beats Fluminense 2-0 to reach Club World Cup final Ayo Edebiri really ...