The apple tree which made him think about gravity can still be seen in the garden.

Because of Science, this happens whether you know about gravity or not.

"Where does the quote about politics and gravity come in?"

She had seldom thought about gravity before, as either friend or foe.

It would take someone who knew something about gravity.

But how is any of this going to answer my original question about gravity and what makes things move?

He had never thought to tell her about induced gravity.

Though I'd have thought you'd learned your lesson about gravity.

So there are many ideas about gravity that can be tested in the lab.

I wanted to ask you something - about gravity.