Insert correct punctuation

So my question is this did you know that the longest tongue in the world measures 3.7 inches and belongs to Stephen Taylor (UK)?

Insert correct punctuation

So my question is this did you know that the longest tongue in the world measures 3.7 inches and belongs to Stephen Taylor (UK)?

There is only one punctuation mark that needs to be added -- at the end of the first sentence. There are two sentences here. Do you know where the first one stops and the second one (the actual question) begins?

??

P.S. Unless the first 5 words are part of what you wish to punctuate. In that case a colon (:) after this and capitalize Did.

So, my question is this: Did you know that the longest tongue in the world measures 3.7 inches and belongs to Stephen Taylor (UK)?

To insert correct punctuation into the sentence:

"So, my question is this: did you know that the longest tongue in the world measures 3.7 inches and belongs to Stephen Taylor (UK)?"