In 1959, Fidel Castro imposed a law forbidding the import of foreign cars, so many Cubans drive and maintain older models. Kate Skogen/JetKat Photo hide caption

itoggle caption Kate Skogen/JetKat Photo

The author, Dr. Gavin Francis, arrived at Halley base on Christmas Eve 2002, at the height of the Antarctic midsummer, when 24-hour sunlight illuminates the vast swathes of empty ice. Courtesy of Gavin Francis hide caption

itoggle caption Courtesy of Gavin Francis

2011: In the early 21st century, attempts to visualize such complex ephemeral phenomena as ocean currents, wind direction, and speed grew increasingly sophisticated, as the volume of real-time data increased and supercomputers proved capable of processing it. This ocean surface current visualization was produced by NASA's Goddard Space Flight Center. Greg Shirah, Horace Mitchell, Hong Zhang and Dimitris Menemenlis/Courtesy of NASA Goddard Space Flight Center Scientific Visualization Studio hide caption

itoggle caption Greg Shirah, Horace Mitchell, Hong Zhang and Dimitris Menemenlis/Courtesy of NASA Goddard Space Flight Center Scientific Visualization Studio