12-06An 1840 design for the Analytical Engine by Charles Babbage - Science & Society Picture Library/Getty Images)
12-04Mother cheetah and her cub in the Masai Mara National Reserve, Kenya - gudkovandrey/Adobe Stock)
12-02Dall sheep rams at Polychrome Pass, Denali National Park, Alaska - Patrick J. Endres/Getty Images)
11-29Aerial view of snowy peaks of Vinicunca (aka Rainbow Mountain), Peru - Jude Newkirk/Amazing Aerial Agency)
11-28Centennial Bridge towering above Soberanía National Park, Panama - David Tipling/Universal Images Group via Getty Images)