Nikola Tesla was a "highly thinking and plain living" man who after learning of such extreme sacrifices his parents made for his education, decided to change the world with his life-energy thru experimentation and inventions.
This topic is aimed at discussing Scientists, Physics, and reaching the Goal of ERE to be able to Pursue anything you can Dream of.
Google books now has every digitalized book for free reading and pdf download from before 1923. (Taking advantage of reading some Harvard donated books about Nichola Tesla to find the "Hidden Inventions and Truths the Powerful Lords of Men do not want you to find out about".)
Gravity is a wonderful thing to mention, that can not still be defined. It is my personal theory and belief that Gravity is on the EM Spectrum, just like Light, and like light has both mass and wave properties, thus it can be amplified (with enough Energy) for instant intergalactic Travel.
You have to think big, live a passionate, motivated, creative, and frugal life in order to change the World with your Soon to be Amazing Inventions for Humanity and the Sciences.