Journalist Dahr Jamail & Professor Peter Wadhams say the resulting release of methane will lead to massive climate disruption, and that we have reached a point of no return.

A look at PrEP, a prevention strategy for people at high risk for contracting HIV. Researchers at the University of California explain how pre-exposure prophylaxis (PrEP) works as they describe a four-year, multi-pronged study of men who have sex with men in Los Angeles and San Diego. Participants a...