If you throw something up, it will fall back down, all thanks to gravity. Right? According to the Huffington post, this isn't necessarily true. Physicists have attempted to weigh antimatter, trying to figure out how it interacts with gravity.
Antimatter has the same mass as matter, but opposite charge and spin. (I didn't know that.) It might be possible for antimatter to fall up instead of down when pulled by gravity. If this is true, is there such a thing as antigravity? Sounds like a science fiction movie, doesn't it.
The article notes that it's difficult to experiment with antimatter, because when it meets regular matter, the two annihilate. Also sounds like a science fiction thing. "Fire anti-matter missile..."
Thus far, the experiments aren't conclusive, but I am so curious to see what will happen! When I was a little girl, I imagined spaceships that would fly with
anti-gravity drives, bouncing from planet to planet. It seemed
self-evident at the time. Maybe the idea was good. ;-)