[Just another Joe]

They were hoping no one would be able to do the math.
You know, todays public education system. /irony

[Willie Green]

There's 453 grams of mercury in ONE POUND...
They were hoping no one would be able to do the math.

There are 453.592 grams per pound.
It is traditional to round UP to 454 grams.

Just being picky. ;^)