Gravity Visualized is a video of physics teacher Dan Burns explaining his space-time warping demo. A 2-kg mass in the middle with rolling marbles show orbits. A large marble rolling with a smaller one next to it will mimic the Earth-Moon system. Two handfuls of marbles thrown in opposite directions will show why the survivors all go in the same direction, just like the formation of the solar system. Imagine how students from K-Gray might play-to-learn with this exceptional space-time simulator!