Word: hydrogenics
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...clutters the near-Earth environment. In this case, that's not likely, since the shuttle was already well into the atmosphere when it disintegrated. Age or metal fatigue could have been responsible as well. All four orbiters were temporarily grounded last June when cracks were found in their liquid-hydrogen fuel lines, damage that may have been caused by vibration, temperature changes or other stressors accumulated over repeated flights. Columbia, as the granddad of all the ships, could have been the brittlest of the fleet. But NASA, for all its alleged shortcomings, leaves little to chance in the regular physicals...
...solar or biomass--can support a profitable business," says Stuewer. Electricity generated by solar, she notes, is five times as expensive (for now) as that produced by gas or coal. Exxon is investing in Stanford's Global Climate and Energy Project, she says, to develop breakthroughs in solar, biofuel, hydrogen and even coal technologies that could be offered cheaply and profitably to developing countries, whose growing economies will require increasing fuel in the future...
...TOOLS: XCAPER SMOKE MASK KIT Fire fighters have long used special masks that completely block hazardous fire-borne toxins like carbon monoxide and hydrogen cyanide. You can get the same level of protection with the Xcaper Smoke Mask kit myxcaper.com $50). The lightweight portable package includes goggles and a powerful pocket-size flashlight--perfect for any fire emergency at home or away...
...force, which is responsible for certain types of radioactivity.) Hypercharge, Fischbach reports in Physical Review Letters, is an extremely weak repulsive force that acts between objects no more than about 600 feet apart and varies in strength from element to element. It is strongest in iron and weakest in hydrogen. Thus, the physicists contend, if an iron ball and, say, a feather were released simultaneously in a vacuum, the iron's repulsive hypercharge would act more strongly than the feather's to counteract the earth's gravity--and the feather would hit first...
...instant later the tip of the booster pivoted into the external fuel tank. The ensuing explosion rocked but did not obliterate the shuttle. "The orbiter itself seemed to float, very briefly, above the fireball of exploding hydrogen and oxygen," said one member of the shuttle inquiry panel. He was reminded of the way a bubble survives a cascade over Niagara Falls, "so fragile, yet with all that wild energy around it." Says a National Transportation Safety Board investigator: "The crew compartment was pressurized and sealed tight and welded into a kind of cocoon or bubble that may have suffered relatively...