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Does the Rayleigh formula apply to electron microscopes or only light microscopes?
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3 votes

This is more than likely better asked in physics SE, however since you contextualized it biologically somewhat I will answer it here. You are correct in your concern. The Rayleigh Criterion and the ...

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Can germs spread by tissues out of box?
2 votes

This definitely possible. Due to the microscopic scale of bacteria and viruses, even very light forces(like those from pulling a tissue out of the box) will lead to those bacteria and/or viruses being ...

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Can the retina emit light?
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I think is an simple yet very applicable answer here. Anything with a temperature will emit photons via thermal radiation.

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