Local Time Line

At 84 and having dusted off his military uniform, Fidel Castro on Friday addressed his first political rally since becoming ill and resigning as president in 2006. Fidel Castro – Cuba – United States – Caribbean – Politics

New research out of the University of Haifa shows a clear link between light at night and cancer in mice, with the suppression of melatonin playing a key role.

As medical procedures go, cooling therapy is simple: Chill the patient about six degrees Fahrenheit — using cold intravenous saline, cooling blankets or ice packs — and wait 24 hours; then re-warm the patient slowly. But it’s having lifesaving effects.

It weighs in at more than 130 pounds, but the authoritative guide to the English language, the Oxford English Dictionary, may eventually slim down to nothing. Oxford English Dictionary – English language – Education – Publishing – England

Rice University students spend their summer in Morocco engineering volleyball-net-like structures to harness potable water from fog in nearby Atlas Mountains.