Advances in organ and computer models are raising the prospect that some animal experiments could be eliminated. But there are still huge hurdles to overcome.

The latest wellness craze involves injecting these molecules for athletic performance, longevity and more. Scientists say the research isn't keeping pace with the health claims.

The spirited back-and-forth may explain why the tariffs case took months for the court to resolve, and it exposed rifts that could prove meaningful for Trump as well as future presidents.

President Trump has repeatedly demanded that Iran give up its nuclear program, including by agreeing not to enrich any more ...