How can you tell if you have a good idea?

We can spend millions on research to test an idea. We can graph the validity of of a concept. We can test a concept in front of a focus group.

We're all humans. The best way to know if an idea is inspiring is this:

After you hear the idea, are you more excited than you were before you heard it?

If you're confused, down or ambivalent, it probably is not a great idea. If you can't remember the next day, it probably isn't either.

But if the next day, you still remember, can easily explain and you still feel excited, you probably have struck gold. We're human, if our adreline is flowing, it's a good sign.