First, there's gravity. We experience it every day, whether it's walking on the ground or dropping an object. Second, there's electricity, which powers so many of the devices we use, from lights to phones to computers. Third, there's motion, which is a fundamental part of everything we do, whether we're walking, driving, or just sitting still. Fourth, there's heat, which is involved in everything from cooking to keeping our homes warm. And finally, there's light, which we use to see and navigate the world around us.