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However,
M&M's are slightly cheaper to purchase than pennies, and they are
preferred when you are asking the students to eat their apparatus.
if you consider that you can use pennies year after year, use them inand
numerous other experiments (measurement, density, voltaic pile, etc.),
that you can recover 100% of their initial cost when you recycle (by
spending) the used pennies, you can't beat the price of pennies.