Word: allowed
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Dates: during 2000-2000
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...reason to start looking forward to October 2007--unless you're one of the four people who could be traveling to Mars that month. October 2007 is a good time to begin your journey, since right about then, Earth and Mars will be drifting into an alignment that will allow you to make the trip in less than eight months. It's impossible to say what part of Mars you'll be touching down on, but odds are you'll land somewhere near the broad equatorial belt. While temperatures elsewhere on Mars fall to a murderous -220[degrees]F, they...
...minute. Why, then, are more than one-third of Americans seriously overweight? Here the report provides what is probably the most important insight of all. While we may not gain as much as we think in winter, we routinely neglect to take off our fresh fat in spring. We allow the pounds to accumulate year after year in tiny increments we hardly notice--until we try to stuff ourselves into our old jeans. Call it stealth flab. Indeed, the massive once-a-decade National Health and Nutrition Examination Survey concurs. It shows that over a 10-year period, the average...
...pulverize a small asteroid or deflect a larger one. Given enough time, and under the proper circumstances, less drastic measures would be needed. Some schemes call for conventional explosives alone, or anchoring a rocket motor or a solar sail on an asteroid to alter its orbit enough to allow it to safely bypass Earth...
...conservatively that time travelers don't change the past; they were always part of it. On the other hand, paradoxical though this sounds, a version of the many-worlds theory of quantum mechanics (see "Will We Discover Another Universe?" in this issue) devised by Oxford physicist David Deutsch might allow such history-changing visits. In this picture, there are many interlacing world histories, so that if you went back in time and killed your grandmother when she was a young girl, this would simply cause space-time to branch off into a new parallel universe that doesn't interfere with...
First, we can make no reasoned conjecture about the frequency, or even the existence, of life elsewhere in the universe. As an optimist by temperament and as a betting man, I allow that certain features of the natural world would lead me to place my chips on yes if someone forced me to wager. But I also know the difference between a pure flutter based on hope and a smart play based on genuine probabilities...