Here's a force that's right under our feet, passes through everything, and holds the entire universe together. It works constantly and has little variation. Yet, it's a total mystery to physicists and mathematicians. Sure - gravity is well defined. It has predictable characteristics.
Nobody knows for sure.
My interest in gravity started when I was just a child, around eight years old. I used to play for hours on a swing holding various objects to observe the momentary weightlessness during the free-fall phase of my swinging. From such a beginning, my interest increased and I've made it my goal in life to figure out how to control gravity . It's the original. It's the one and only.