THE GRADE WORKING GROUP IS DEVELOPING and evaluating a common, sensible approach to grading quality of evidence and strength of recommendations in health care. In this article, we discuss the ...

You all know the score. A train leaves one city travelling at 35 miles per hour and another races toward it at 25 miles an hour from a city 60 miles away. How long do they take to meet in the middle?

Thomas Edison is noted in history for his many inventions, including the light bulb. But many people are unaware that he is credited for inventing the ticker tape machine that was used to broadcast ...

A series of parallel lines engraved in an animal bone between 1.4 and 1.2 million years ago may be the earliest example of human symbolic behaviour. University of Bordeaux experts say no practical ...