The law of gravity says no fair jumping up without coming back down. Rainbows are just to look at, not to really understand. Most books now say our sun is a star. But it still knows how to change back into a sun in the daytime. A vibration is a motion that cannot make up its mind which way it wants to go.
Vacuums are nothings.
We only mention them to let them know we know they're there. There is a tremendous weight pushing down on the center of the Earth because of so much population stomping around up here these days. Some people can tell what time it is by looking at the sun. But I have never been able to make out the numbers. In looking at a drop of water under a microscope, we find there are twice as many H's as O's.