Does Gravity Exist?

Luke Dickinson or Dickieson has a question about gravity, antimatter and hoverboards. Does gravity exist? Excuse me, does anti-gravity exist? And where are the hoverboards? That's funny because people born in the era of Back to the Future, they want the hoverboards. They downscaled a rollerblaze. Nobody thinks of flying cars to go joy riding in them. But anyone who's thinking of a hoverboard is ready to just rock the slopes.