It’s a part of summer in Canada that the tourism brochures don’t always tell you about—mosquitoes. They can turn an otherwise idyllic summer evening into an indoor retreat. And unfortunately, the problem might be getting a little worse. That’s because a few more species of the blood-sucking pests are showing up in Canada—both by increased…

Although there is a growing list of Alzheimer’s disease susceptibility genes, even if you put them all altogether, they account for less than half of all Alzheimer’s cases. The single most compelling piece of data on the potential control we have over the disease is the fact that if you have identical twins, with the…

SAN DIEGO—Marine scientists say they have found what they believe to be more than 25,000 barrels that possibly contain DDT dumped off the Southern California coast near Catalina Island, where a massive underwater toxic waste site dating back to World War II has long been suspected. The 27,345 “barrel-like” objects were captured in high-resolution images…