Sun damage can start within minutes. Learn how quickly it happens, what factors influence your risk, and how to protect your ...

Take a brief walk outside and you're likely to encounter a wide range of things that could influence your health—the sunlight ...

Tuberculosis (TB) can transmit via the air, and the risk of infection depends on several factors. These can include the duration of exposure, proximity to a person with the infection, and immune ...

It has been hypothesized that early exposure to thimerosal, a mercury-containing preservative used in vaccines and immune globulin preparations, is associated with neuropsychological deficits in ...