Dilandu
I'm dissatisfied, which means, I exist.
One small problem. Such discovery is made by SCIENTISTS, not by poorly-educated inventors, tinkering in garages with jury-rigged equipment. Wright brothers were able to make practical plane because they done extensive research firs (with wind tubes, gliders, ect.), and started to build plane only when the were sure that their theory is sound. Atomic energy required massive facilities and thousands of men to tackle. Fusion energy required international-scale funding for decades, and only recently some progress toward practical solution was observed.Once a world-changing discovery is published, scientists in countries who can exploit it will exploit it. The discovery of atomic fission propelled the development of atomic bombs. The discovery of practical antigravity could take spaceships that are weightless to orbit and on to other planets. It could also conceivably be used as a weapon. When manned powered flight became possible, machine-guns were added.
To put it simpl, it's utterly impossible for some "unrecognized genius" to accidentally discover something as fundamental as antigravity. Modern science simply do NOT have such big holes, that amateur working in garage could make such a monumental discovery. If there WAS such hole, its presence would be obvious by massive indirect signs, like unexplained inaccuracies in precise equipment, disrepancy between practical and theoretical results in gravity research, large-scale phenomenons in astronomy, particle physics, ect.