quantum gravity

Here is my explanation I would present to those smart and curious folks who want to know why gravity works. My mom fit in this category, bless her soul.

The Universe is really old. The only thing that lasts as long as that is something which does nothing. Here is the problem with doing nothing: there is other stuff in the Universe. That other stuff prevents our stuff from being utterly alone. If we could be utterly alone, there would be no gravity and no light.