An algae bloom has turned sea water around the Florida Keys into a thick green sludge.
U.S. researchers say they have found a 208-foot wooden vessel that sank in Lake Michigan almost 80 years ago in a storm.
Some long-grain rice in the United States has been contaminated with a genetically engineered variety not approved for human consumption, the government says.
A worker digging up bedrock in Connecticut unearthed a three-toed, fossilized dinosaur footprint that is thought to be from a dilophosaurus.
Australian Health Minister Tony Abbott says there is no evidence that stem-cell research will lead to a breakthrough in the treatment of diseases.
U.N. special envoy on AIDS in Africa Stephen Lewis has urged delegates at an AIDS conference in Toronto to talk less and do more about the problem.