Can you spot a fake $10 from the real thing? It's getting harder these days, but you can still do it using a microscope.
US dollar bills are make of a mix of cotton and linen, which is why they don't fall apart when you leave them in your pants pocket and they go through the water. They also have trace amounts of iron embedded in them, so they flex slightly toward a strong magnet. Can you find the owl on the dollar bill?
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