A Sack of Magnets
A man buys some magnetic spheres from a shop, cheap. He takes them home in their
bag, and pours them onto a table. They all roll around a bit, before finally
resting here and there. The man immediately knows he has a faulty product, even
though he hasn't even tried using them yet. Do you know how?
See result
When they left the bag, they rolled around on the table. If they were
magnetic, then they would not have been able to roll around so much
because they would have been stuck together!
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