Word: hydrogens
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...setting dials and plugging in patch cords in an arrangement that resembled an old-fashioned telephone switchboard. Data were fed into ENIAC in the form of IBM punch cards; a million cards were required for the monster's first assignment, a top-secret numerical simulation for the still untested hydrogen bomb. Every time a tube burned out, which happened twice a day at the start, a technician had to rummage among the tangle of wires to locate and replace the dead component. To prevent rodents from nibbling at ENIAC and destroying vital parts, Eckert recalled at the anniversary party...
...Challenger's right booster had either melted or wrenched loose the struts that held the booster to the lower end of the external tank. The booster then pivoted on its still intact upper-attachment fitting and crashed its nose into the tank wall. The escaping liquid oxygen and liquid hydrogen ignited, causing the fatal explosion. At week's end NASA had not commented on the report...
...time of the launch the air temperature had risen to 38 degrees, but a dramatically lower temperature on the surface of the booster might have been an indication that supercold liquid hydrogen was leaking from the huge external fuel tank, investigators...
Richard Feynman, a physicist on the presidential commission, said he does not believe the low temperature readings were caused by a cold hydrogen leak. In Wednesday's editions of the Washington Post, he said the readings could have been a result of breezes blowing past the cold external fuel tank onto the booster rocket...
...Andrei Sakharov, will win his freedom any time soon. Sakharov's wife Yelena Bonner was given permission last fall to visit Boston for treatment of a heart condition. But Gorbachev told the French Communist newspaper L'Humanite last week that the nuclear physicist, who had helped develop the Soviet hydrogen bomb, "is still considered in possession of state secrets and cannot leave the U.S.S.R...