The tank of each plane holds just enough fuel to take it halfway around the world. Any desired amount of fuel can be ...

Well-meaning efforts to assess learning accurately have led some schools to set 50 as the lowest grade, but that can have ...

Math Masters began as a fifth-grade math competition program in 1989 with teams from 44 schools taking part. In 1995, the competition was expanded to include sixth ... a week and practice and ...