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kevinforsyth.net
To Reach the High Frontier: A History of U.S. Launch Vehicles
"A valuable contribution to the field of aerospace literature," this book includes an extensive overview of Delta history and development along with chapters on Atlas, Titan, Scout, Space Shuttle, and much more.
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Many other excellent books about spaceflight are recommended here.
07-May-01 | RXTE finds evidence of frame dragging
An astronomer at Goddard Space Flight Center using the Rossi X-ray Timing Explorer has found observational evidence that rotating black holes create a whirlpool effect, essentially twisting the fabric of spacetime around them. (NASA Press Release, 30-Apr-01) This may sound like old news, as LAGEOS-1 helped scientists determine much the same thing about the Earth, albeit on a lesser scale, some three years ago. RXTE was launched on Delta 230 in December 1995. (LAGEOS dates back to 1976, aboard Delta 123.)