Storm clouds over Crater Lake National Park, Oregon (© Joseph Giacalone/SuperStock)(Bing United States)

[20180522] - 'Storm clouds over Crater Lake National Park, Oregon (© Joseph Giacalone/SuperStock)(Bing United States)'

Namib Desert, Namibia (© Valerio Leone/Solent News/REX/Shutterstock)(Bing United States)

[20180521] - 'Namib Desert, Namibia (© Valerio Leone/Solent News/REX/Shutterstock)(Bing United States)'

Jeff Koons

[20180520] - 'Jeff Koons' 'Puppy' outside the Guggenheim Museum, Bilbao, Spain (© Martin Child/Aurora Photos)(Bing United States)'

Paratroopers fill the skies over Fort Bragg in North Carolina, for Operation Toy Drop (© Stocktrek Images/SuperStock)(Bing United States)

[20180519] - 'Paratroopers fill the skies over Fort Bragg in North Carolina, for Operation Toy Drop (© Stocktrek Images/SuperStock)(Bing United States)'

A peregrine falcon surveys the concrete canyons of Chicago (© Luke Massey/Minden Pictures)(Bing United States)

[20180518] - 'A peregrine falcon surveys the concrete canyons of Chicago (© Luke Massey/Minden Pictures)(Bing United States)'

Historic fishing warehouses in Trondheim, Norway (© Oscar Dominguez/Tandem Stills + Motion)(Bing United States)

[20180517] - 'Historic fishing warehouses in Trondheim, Norway (© Oscar Dominguez/Tandem Stills + Motion)(Bing United States)'

English oak tree in a cultivated field in Monmouthshire, Wales (© Phil Savoie/Minden Pictures)(Bing United States)

[20180516] - 'English oak tree in a cultivated field in Monmouthshire, Wales (© Phil Savoie/Minden Pictures)(Bing United States)'

Bush hyrax colony in the Mara North Conservancy, Kenya (© Jonathan & Angela Scott/Aurora Photos)(Bing United States)

[20180515] - 'Bush hyrax colony in the Mara North Conservancy, Kenya (© Jonathan & Angela Scott/Aurora Photos)(Bing United States)'

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