Black holes about the size of a hydrogen atom may be careening into the solar system without being noticed. But their days of stealth may be numbered. Two teams of researchers propose methods to search for these hypothetical small objects, which would have the mass of an asteroid. Because they would have formed at the […]

The ocean circulation system may not be as bad as previously thought. A vital oceanic artery known as the Florida Current, a signal of the ocean’s ability to regulate Earth’s climate, has apparently been weakening for decades. But this latest decline may not be as severe as suspected. The current has actually remained stable over […]

It was like a Ph.D. student Dionna Williams realized fundamental flaws in the way medical science treats people who have HIV and also use illegal drugs or misuse prescription drugs. People in this group often have worse outcomes than people with HIV who do not use these drugs. Drug use and addiction have been linked […]

The opposing fountains of plasma and particles spanning 23 million light-years are the longest pair of black hole jets ever seen. That’s far enough away to affect the evolution of the universe on a cosmic scale, astronomers report Sept. 18. Nature. “Traditionally, astronomers believed that all jets remain within, or at least very close to, […]