Scientific progress.

We are not discoverring any new laws of physics, string theory has been in the hypothesis stage since the mid 70s and things like DNA and computers are just complex arrangements of existing knowledge.

Has science reached the point where the only thing left to do is invent?

New things are being discovered all the time. The people in Newton's time didn't know about his laws and stuff, until after a while, when it became widely accepted. Einstein was just a quack, until a solar eclipse showed evidence of GR.

Likewise, the Afshar experiment which the common guy has never heard of at all, and as revolutionary as it may be, is still being discussed and debated, until it's disproved or strong evidence is available.