Word: existences
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Dates: during 1950-1959
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...They can also be made artificially by high-energy gamma rays from radioactive elements. Positrons do not last long; as soon as one of them hits a normal electron, both particles are annihilated, turning back into the energy out of which they were made. But the proof that positrons exist was a victory for believers in nature's symmetry. Better still was the fact when a positron is created, it always appears in a "pair" with an ordinary negative electron...
...positive electrons exist, why not negative protons? Scientists searched for them for years in cosmic rays, but found only a few doubtful cases. They hoped to create them in the laboratory, but no existing cyclotron had enough power. It took the Berkeley Bevatron to create an antiproton out of energy. Like the positron, it, too, appears only paired with an ordinary proton, and destroys itself as soon as it collides with a proton...
...increase. This is the conclusion of the National Academy of Sciences (TIME, June 25), and the public is justified in taking it seriously. But in many parts of the world, the atom is being blamed for ills that it could not have caused, and for some that do not exist...
...official rates stand much higher than the free rate. Among these are France's franc (which was selling in the U.S. last week at 395 to the dollar, v. 350 in Paris), Bolivia's boliviano (5,5°° ". 190), Argentina's peso. Even where limits exist-as in Spain, Finland, Turkey-tourists can take in the legal amount and still make a saving. Where money is stable and the saving small, travelers still find it handy to take along local money for early-arrival tips, taxis, incidentals...
...most obvious and provocative speleological problem," writes Caveman Folsom, "is this: where, exactly, are all the thousands of caves that surely exist but whose whereabouts are not yet known...