Sentence examples for old idea from inspiring English sources

It's an old idea.

This is an old idea.

It is actually a fairly old idea.

Mimicry of nature is an old idea.

"It's like an old idea.

Two new shows on an old idea.

This is, of course, an old idea.

A new study confirms an old idea.

Nuclear propulsion is an old idea.

Generated mail is a pretty old idea.

But it's an old idea, too.