Comet Crash !

For a week in July 1994, the collisions of about 20 fragments of the comet Shoemaker-Levy 9 into the planet Jupiter captured the attention of stargazers around the world. Comet watchers marveled, since the display turned out to be, as one astronomer put it, “the celestial drama of the century.” Why did this event far exceed expectation...

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Those Awesome Baby Brains

They are awesome from their beginning. Three weeks after conception, they start out with 125,000 cells and thereafter increase in spurts of 250,000 cells a minute. Each little brain continues its explosive growth until at birth its cells number some 100,000,000,000—as many as there are stars in the Milky Way! But months before that, while still in the womb, baby’s brain has gone into operation. It is registering perceptions from its watery environment. It hears, tastes, senses light, reacts to touch, learns, and remembers. The mother’s emotions can affect it. Gentle words or soft music calms it. Angry speech or rock music agitates it. The mother’s...

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The Power of Spider Silk

It is lighter than cotton, yet ounce for ounce it is stronger than steel. For decades scientists have studied the silk produced by orb-weaving spiders. Dragline silk—the strongest of the seven silks these spiders can spin—has attracted the most attention. It is tougher and more waterproof than silkworm strands, which are commonly used in clothin...

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Smoking Deaths Helpful to the Economy?

“Philip Morris Cos. officials in the Czech Republic have been distributing an economic analysis concluding that . . . smokers’ early deaths help offset medical expenses,” says The Wall Street Journal. “The report, commissioned by the cigarette maker . . . , totes up smoking’s ‘positive effects’ on national finances, including revenue from excise and other taxes on cigarettes and ‘health-care cost savings due to early mortality.’” The article adds: “Weighing the costs and benefits, the report concludes that in 1999 the government had a net gain of 5.82 billion koruna ($147.1 million) from smoking...

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