When Isaac Newton quantified gravity, his theory explained how everything in the world around us behaved in its presence.  It opened a door to an understanding of something fundamental, yet elusive in explanation.   Centuries later, Einstein came along and took a step back, finding a larger more comprehensive theory of gravity, one that explained the strange things that happen in the grand universe.  His theory could even explain things that Newton’s theory of gravity could not, such as the odd orbit of Mercury around the Sun.  But the greatest part of Einstein’s theory is that if you use it to...