Free Republic

The 20-year-old nursing-home employee from suburban Pittsburgh who tried to assassinate former President Donald Trump was a registered Republican who packed explosives in the vehicle he drove to the campaign rally an hour from his home. Law enforcement officials were working Sunday to learn more about Thomas Matthew Crooks of Bethel Park, Pennsylvania, to determine what motivated him to open fire on the rally from a nearby rooftop, killing one spectator, before he was shot dead by the Secret Service. -- SNIP -- Crooks tried out for the school's rifle team but was turned away because he was a bad...

Progress Toward the Dream of Space Drives and Stargates by Paul Gilster on May 23, 2011 by James F. WoodwardI first wrote about James Woodward’s work in my 2004 book Centauri Dreams: Imagining and Planning Interstellar Exploration, and have often been asked since to comment further on his research. But it’s best to leave that to the man himself, and I’m pleased to turn today’s post over to him. A bit of biography: Jim Woodward earned bachelor’s and master’s degrees in physics at Middlebury College and New York University (respectively) in the 1960s. From his undergraduate days, his chief...

Following the longest flight yet by an air-breathing scramjet engine, the X-51A Waverider team is waiting to see whether the largely successful first launch of the hypersonic demonstrator will unlock funding for further development of the ­technology. The X-51A was launched over the Pacific on May 26, achieving scramjet ignition and acceleration, but the engine ran for only 200 sec. rather than the 300 sec. planned, and the vehicle reached around Mach 5 instead of accelerating beyond Mach 6. When it began to slow down and telemetry was lost, the flight was terminated and the vehicle destroyed, says Charles Brink,...

Apple's newly acquired OS, NeXTstep was built on the Mach 3.0 kernel, the same microkernel used by GNU/Hurd. Though by then the Mach kernel was largely abandoned, another kernel, Linux, was gaining support and seeing rapid development. The project at Carnegie Mellon to develop Mach had ended in 1994, two years before Apple acquired NeXT. As early as 1991 papers were published documenting performance issues with the Mach kernel. At the time there was much debate over kernel design, 1992 marked the now famous flame war between Linus Torvalds and Andy Tanenbaum over monolithic vs. microkernel design. Even though Apple...

<p>Rival battery makers Energizer Holdings Inc. and Gillette Co. slug it out daily on retail shelves and TV screens nationwide.</p> <p>But lately, Gillette and Energizer have taken their fight to the courtroom, this time over competing razors. Gillette accuses Energizer's Schick Quattro and Intuition of violating its patents.</p>

Date: Posted 7/12/2002 Fully Integrated Scramjet Missile Engine Tested At Mach 6.5 The Office of Naval Research (ONR) and the Defense Advanced Research Projects Agency (DARPA) successfully conducted the first-ever ground test of a full-scale, fully integrated hypersonic cruise missile engine using conventional liquid hydrocarbon fuel on May 30, 2002. The test, performed in a wind tunnel at NASA Langley Research Center, Hampton, Va., demonstrated robust operation of the engine at simulated hypersonic cruise conditions (Mach 6.5 at 90,000 feet altitude). Demonstration of efficient supersonic combustion ramjet (scramjet) performance with a liquid hydrocarbon fuel is an essential step to enabling...