It's one thing to detect a substance, but it's another thing to be absolutely certain of its composition, which is what you get with mass spectrometry.

What we are talking about is something that monitors the environment in real time. This technology is practical because it is portable, rugged and accurate.

To be absolutely certain about something, one must know everything or nothing about it.

There is no cannibalism in the British navy, absolutely none, and when I say none, I mean there is a certain amount.

Words are shadows, action is substance.

It's hard to prove yourself when the substance isn't there in certain roles.