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Stethoscope and heap of paper cards (File photo credit: Garsya via Shutterstock)

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The skeleton of an ancient man with a skull. archaeology, anthropology. science. history of antiquities. artifact. File photo credit: GAS-photo via Shutterstock

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A man buys fresh champignon mushrooms at a farmer's fair. (I.K. Media via Shutterstock) **FILE**

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Swirls of whipped cream. File photo credit: Milleflore Images via Shutterstock

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Empty chairs at an airport (Galina-Photo via Shutterstock) **FILE**

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A toddler explores how a fan works. (Falon Koontz via Shutterstock) **FILE**

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High school classroom. (File photo credit: cactus_camera via Shutterstock) ** FILE **

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The campus of the American University, a private research university in Washington, D.C. (EQRoy via Shutterstock)

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Fingers crossed. File photo credit: BlurryMe via Shutterstock.

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File photo, man with fingers crossed. Credit: Ground Picture via Shutterstock.

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Close up shot on film studio set. File photo credit: Gorodenkoff via Shutterstock.

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Jaws bridge in Martha's Vineyard. File photo credit: Van Buren Photography via Shutterstock.

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Jaws bridge in Martha's Vineyard. File photo credit: Van Buren Photography via Shutterstock.

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Closeup of a bartender pouring a dark stout beer at a pub. (Shutterstock/IsabellaO)

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The flag of the United States Space Force flies high on a sunny afternoon as a half moon rises behind it. File photo credit: Ajax9 via Shutterstock.

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The flag of the United States Space Force flies high on a sunny afternoon as a half moon rises behind it. File photo credit: Ajax9 via Shutterstock.

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James Madison's Montpelier. File photo credit Rob Pauley via Shutterstock

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Thomas Jefferson's famous Monticello home in Virginia. File photo credit N8Allen via Shutterstock.

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JUNE 8, 2019: Bureau of Alcohol, Tobacco, Firearms and Explosives - ATF - Department of Justice - sign at headquarters building. File photo credit: DCStockPhotography via Shutterstock.