then why don't we have some "anti-gravity" device by now...?! No one has ever given me a clear definition of gravity. Yeah it's a force.. that makes things stick to it... what about intricacies?! What's the true properties of gravity? If we really understood it, we'd be able to get off this planet without using combustable rocket propulsion, and why is every attempt at it laughed at, skorned, and debunked? How will this ever achieve any advancements in physics or technology?