At school, after proving a theorem by means of mathematical or scientific demonstration it was the done thing to close with the letters QED (schoolboy humour gave it as meaning Quite Easily Demonstrated ). This indicated that in your view, not always the master's, you had presented sufficient logical argument to prove the case.

Res ipsa loquitur, leaving aside the legal definition, seems closest to the French “ça va sans dire” or “that goes without saying”.

But taking Jackie's three statements:

It's raining.
My eyes are brown.
It's a long way from here to England.

The first two are facts, while the third is debatable, England is quite close compared to Mars [duck and run-e].