What is the difference between a moon and a planet? Trick question! According to scientific definitions, there often isn’t much of a difference at all. That might seem counterintuitive, but it’s true.

Tech-enhanced, high-quality instructional materials feature virtual simulations, video libraries, and hands-on explorations to drive learning and engagement for students from all backgrounds ...

It may seem easy to distinguish whether something is alive or not. You are alive, as is your teacher, and the trees you see on your way to school. Your desk and chair are not alive, and neither are ...