The US national kilogram that was made in 1879 is photographed at the National Institute of Standards and Technology on Tuesday November 13 in...
{"Image ImageDescription": "GAITHERSBURG, MD - NOVEMBER 13: The U.S. national kilogram, that was made in 1879, is photographed at the National Institute of Standards and Technology on Tuesday, November 13, 2018, in Gaithersburg, MD. (Photo by Salwan Georges/The Washington Post via Getty Images)", "Image Copyright": "2018 The Washington Post"}