[capnq]

As a side note I recently heard that there is strong evidence to support the fact that C is not as constant as we once thought. Apparently the speed of light has been slowing down slightly over the Last several billion years.

Where did you read this?

This may not be what he's thinking of, but it was the most likely candidate Google pulled up: Speed of Light, Other Constants May Change {link}

This also reminded me of another theory, that the gravitational constant G may also decrease over time. Here's a link which mentions that: Interview with Paul Dirac {link}