What did Newton understand that was such a revolution? Can someone just... explain gravity to me? Let's start with a ...

Could a reactionless, gravity-defying propulsion system actually work? A former NASA engineer says yes, but scientists are skeptical.

Molecules of water near Earth's poles are pulled mostly straight down toward the planet's center of gravity ... works against Earth's gravity to form two bulges: the high tides.

While the company behind the drive, Exodus Propulsion Technologies, says that the drive can achieve a thrust to counteract Earth’s gravity ... an object and allow center-of-mass translation ...