The Raven Paradox - Can anyone explain this in layman's terms?

No one’s ever taken me to the lab to check, though an awful lot of other humans (and other similar entities) have been observed: is there any evidence at all for the claim that my body is made up of carbon-bearing organic molecules?

So the difference between the strong and weak phrasings is the difference between using observations as support for the claim P and using observations as support for the claim “Observations appear to support the claim P”?