1. The first six to eight months was all about proof of concept.

2. She must provide proof of her mental health treatment or go back to jail.

3. Because one day there may well be proof of multiple universes.

4. If you think your email address is proof of who you are, think again.

5. There are plenty of numbers available for those looking for proof points.

6. The agency has applied for funding to run a proof of concept of the system.

7. If you want to see the real examples as proof, let me know.

8. His wife was sent a digital message claiming to offer proof he was having an affair.

9. It could also be used as proof of insanity.

10. The only way to really know is to work with IBM to conduct a proof of concept test.

11. Instead, they were proof that more work needs to be done.

12. Once those proof points are out there, it makes it easier for policies to follow.

13. The company says it has seen no proof of unauthorized access to PayPal, its online payment service.

14. They immediately removed them after approval, as they had had their proof of concept.

15. Or you need proof your neighbor is letting their dog do its business on your lawn.