For centuries, people all over the world have told stories about ghosts. In many cultures, the dead are believed to come back ...

Genetic research does not always produce tidy answers. Sometimes it reveals traces that raise more questions than they settle. In recent years, scientists studying human DNA identified genetic signals ...

Nearly one-third of physicians enrolled in Medicaid don’t treat patients covered by the program, according to a study published Feb. 2 in Health Affairs. A team led by researchers at Portland-based ...