Look guys, TheEngineer pulled this on me too. The only reason I can see he does this to people is to stir up arguements. Gravity, as explained by the curvature of space time by mass, isn't TECHNICALLY a force. There's nothing "pushing" us towards the Earth, we just want to go towards the Earth. However, gravity is considered an important aspect of mass, because without it we wouldn't have Earth, which is why it's considered one of the "four forces". To anyone in normal conversation, besides extremely stringey physicists and dicks that like arguing, gravity is a force, but in the strictest sense it's not a force - it's just a property of matter.
(edited a spelling error)