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Leonardo da Vinci describes the use of flight testing apparatus to understand aerodynamics. The leaf outline denotes a reused sheet of paper. (Photographs provided by Smithsonian Libraries)

Leonardo da Vinci describes the use of flight testing apparatus to understand aerodynamics. The leaf outline denotes a reused sheet of paper. (Photographs provided by Smithsonian Libraries)

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Special Counsels Rack Up Bills

Robert Mueller’s special counsel investigation into Russian meddling in the 2016 election has cost $6.7 million during the first four and a half months of the probe. Click to see past independent counsel investigations guilty of racking up high bills.