Some deep shit

Quick fix: replace feathers with styrofoam

It's one of those riddles that is designed to trick and make the person say the denser object with the same weight weighs more, the one instance where it doesn't work is with precious metals - gold, silver, etc. and gemstones which are weighed in troy ounces. One pound (troy pound is 12 troy ounces) is about 20% lighter than one avoirdupois pound (16 [standard] ounces). So if someone asks which is heavier a pound of feathers or a pound of gold, the [avoirdupois] pound of feathers is heavier than the [troy pound] of gold.