When Mojave, the new version of MacOS, launched in September 2018 it bought a collection of new desktop wallpapers that show a Mojave desert sand-dune as it changes throughout a 24-hour period.

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So much of nature is just as ominous as it is beautiful. And that’s definitely true of the sand dunes in Slowinski National Park, Poland. Set along the country’s Baltic coastline, the 186.18 ...