How many US patents did Edison hold during his lifetime?
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Here's one you can try at home: limes have a higher density than lemons. While they both look similar, a whole lime will sink in water, while lemons will float to the surface.
Image credit: Levin C. Handy (per http://hdl.loc.gov/loc.pnp/cwpbh.04326), Public domain, via Wikimedia Commons.
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