Quoted:
I love the half glass question.
I always ask the person a Question back. What is your objective, are you trying to fill the glass or empty the glass. Is half full your objective. My answer will be based on your objective not mine because I could care less.
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The glass is completely full of water, nitrogen, oxygen, and argon
Quoted:Fine, take a piece out of each bag.
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A penny scale designed weigh a person is going to be accurate enough for you to decearn a quarter ounce between two coins.
I'd just grab an equal number of pieces from two bags and compare them by hand. The scale is a red herring. If you can't feel a 25% difference in weight, you probably have nerve damage.