Middle and high school students who bully their classmates are more likely to use cigarettes, alcohol and marijuana than other students, according to a new study.

Brain and eye problems have surfaced in astronauts who spent more than a month in space, marking a potential setback to plans for longer deep space missions, according to a US study.

Even when told that death is likely, families of intensive care patients tend to be overly optimistic about the possibility of recovery, a new study finds.

Dick Sandhaus, a healthy and fit 62-year old, says he never gave his balance a thought until he lost it.