Word: less
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Dates: during 2000-2000
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...Lawrence Livermore national laboratories are already dreaming up a variety of ingenious defenses against an incoming asteroid. Depending on its mass and composition, they would use tailor-made nuclear explosions to 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...
...scientific spirit in the 17th and 18th centuries was one of the things that stopped the burning of witches. Learning how the universe is governed by the impersonal principles of a final theory may not end mankind's persistent superstitions, but at least it will leave them a little less room...
...such a wormhole to travel into the past. Here's how you do it: move one mouth of the wormhole through space at nearly the speed of light while leaving the other one fixed. Then jump in through the moving end. Like a moving astronaut, this end ages less, so it connects back to an earlier time on the fixed end. When you pop out through the fixed end an instant later, you'll find that you've emerged in your own past...
...wormholes is that the openings are microscopic and tend to snap shut a fraction of a second after they're created. The only way to keep them open, as far as we know, is with matter that has negative density. In layman's terms, that's stuff that weighs less than nothing. This may sound impossible, but the Dutch physicist Hendrik Casimir theorized in 1948 that holding two plates of electrically conducting material very close together in a vacuum actually does create a region of negative density that exerts an inward pressure on the plates. The force predicted by Casimir...
...mile was a comparatively sleepy 4 min. 12 sec. It wasn't until 1954 that Roger Bannister of Britain cracked the 4-min. mark, coming in six-tenths of a second under the charmed figure. In the half-century since, uncounted thousands of mile heats have been run, yet less than 17 additional seconds have been shaved off Bannister's record--about a third of a second per year...