Will We Ever Figure Out How to Defy Gravity?

The gravitational force is by far the weakest of the four forces of nature. It’s simple to defy gravity: just lift something in the air. But the annoying thing about gravity is that it’s both persistent and has an infinite range, which takes a surprising amount of work to overcome. Gravity is so weak that even if it were a billion times stronger than it is now, it would still be the weakest of all the forces. The whole mass of the Earth is pulling on you, but you can reach over and g