Jon currently skates three miles a day, two days a week at a skating rink. how can he increase the intensity of his skating?

What is an important step to prove something is valid or not? determining the reliability observing research testing

What is the difference between drug misuse and drug abuse?

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the dependent variable in galileo's experiment?