A zombie crawls through New York's Union Square during a promotion for the AMC network television series The Walking Dead. Stan Honda/AFP/Getty Images hide caption

itoggle caption Stan Honda/AFP/Getty Images

English novelist Jane Austen is known for her polished prose, but her handwritten manuscripts reveal some telling grammatical errors. Hulton Archive/Getty Images hide caption

itoggle caption Hulton Archive/Getty Images

A snowflake from Kiruna Sweden. Large, well-formed crystals like this one, which is between 2 and 5 mm, usually form when the temperature is around -15 degrees Celsius. A special photo-microscope and colored lights were used to capture the image. Kenneth Libbrecht/Lenart Nilsson Award hide caption

itoggle caption Kenneth Libbrecht/Lenart Nilsson Award