Bats actually use two different types of calls (constant frequency and frequency modulated) that tell them different information about objects around them (location/distance/texture/shape). en.wikipedia.org/wiki/Hea…
Microwave ovens do not heat food by operating at a special resonance of water molecules. Instead, in a phenomenon known as dielectric heating, molecules in food rotate as they try to align themselves with the alternating electric field, colliding with other molecules and heating the food. wtamu.edu/~cbaird/sq/2014…

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