Aerodynamics and Rocket Turbopumps, a Washington, DC Vacation

  Yufang and I jaunted to Washington, DC for a few days this past week for some much needed R & R.  While we were there, we visited the National Air and Space Museum (NASM), the NASM Steven F. Udvar-Hazy Center, walked the Mall at night, and dropped in at the Smithsonian Zoo, albeit when …