More than 300 years ago, a smart scientist named Isaac Newton came up with three basic laws that describe the way things move. One of these laws says that for every action, there is an equal and opposite reaction. This is the most important idea behind how rockets work. When we launch things into space, we do so by putting them on rockets with enough fuel — called propellant — to boost them above most of Earth’s atmosphere. The propellants give the rocket enough energy to boost away from Earth’s...

4 Ways To Help Your Church Members Redeem Their Taps, Swipes & Clicks If you’re like most people, you check your smartphone first thing every morning and make it the last thing you check before you go to sleep. You also pick it up several times during the day to find out what your friends are up to, to get your mind off the stresses of life, to keep up with pop culture or to entertain yourself while on the toilet. How many times does “several times a day” actually...