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	Paul Émile Appell	Appell–Humbert Theorem	Appertization	Appert's First Can	Nicolas Appert
Giulia Tofana	Aqua Tofana	Aqueduct of Falloppio	Saint Thomas Aquinas	Yasser Arafat	François Arago Medallion
Arakawa's Syndrome	Aran Son of Shem	Arantius Duct	Julius Caesar Aranzi	$In optics, the Arago spot, Poisson spot, or Fresnel spot is a bright point that appears at the center of a circular object's shadow due to Fresnel diffraction. This spot played an important role in the discovery of the wave nature of light and is a common way to demonstrate that light behaves as a wave (for example, in undergraduate physics laboratory exercises). The Arago spot was result of experiments conducted by Dominique François Jean Arago.$ Arago Spot	François Arago
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