A pound of feathers weighs more than a pound of gold.
I hate that. That's like saying "A british Pound weighs less than a pound of feathers"
It's different measures of "pound." It's not an interesting fact, it's a brain teaser.
Still a bloody fact though isn't it. 
No, it really isn't. A pound of feathers weighs exactly as much as a pound of gold.
A pound of feathers weighs about three ounces more than a Troy Pound of gold.
Picky picky picky. Sheesh. But hey, it's your thread.
No, if I were picky, I would have said 2.834 ounces, and not "about three ounces."

EDIT: And anders, the Troy weight system is French. The Avoirdupois weight system is likewise French. And the GBP is, amazingly enough, British.
Also, ironically enough, Swedish jewelers still use Troy weight. So *PBBBBTT*
