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Wall Street survivor is a great free online stock market simulator.
Sign up for free HERE - Practice thestock market simulator>, without risk
Two technicians from NASA's Goddard Space Flight Center in Greenbelt, Md., are pictured here working with a "Mass Simulator" for the James Webb Space Telescope.
Credit: NASA's Goddard Space Flight Center/Chris Gunn
The Nikon focal-length simulator with markings for a DX (i.e. 1.5xcrop-sensos). Gives a picture of what different lens focal-lengths mean in practice
Celestial Sphere Assembly, Landing Window and the Mirror, Beam Splitter, Rendezvous Window, Apollo Command Module Simulator
Mary Baker Engen Restoration Hangar
Steven F. Udvar-Hazy Center
Smithsonian National Air and Space Museum
Chantilly, VA