Just been re-reading my wibble about romanesques and noted that a strand of human DNA is about a metre long.
The rough number of cells in a human body is 50 to 75 trillion cells. So - presuming only 30 trillion of those actually have DNA (I have a notion that some don't), how far would all the DNA in your body stretch?
Just over 100 round trips from Earth to the Sun. In your body, right now.
Cooool. Who can we test it on?