It's the reason we're stuck to this planet, yet we still can't quite put our finger on what it is.
Some say it's the pull of mass, the warp of space-time, the gentle tug of an unseen force.
Others claim it's just the Earth's giant hairball of a gravity, a cosmic doo-wah of doom.
We may never know the truth, but that's what makes it so... interesting.
1. The Theory of Mass - It's all about the mass, baby!
2. The Space-Time Warp - Time-space continuum, the ultimate party crasher!
3. The Hairball of Doom - It's a giant, cosmic hairball, and it's got us all in its grasp!