All good fun. But in the aftermath of the Columbia disaster, the value of commercial research on missions has come into question. STS-107-the final flight of the Columbia-had 80 experiments on board, including five that were conducted by the astronauts for private companies, funded almost entirely by NASA. One was for International Flavors Fragrances , which extracted the smell of a rose in space and was back seeking new scents. The other commercial experiments involved studies of ways to fight fire using fine Water mist, grow proteins with greater resilience to disease, manufacture crystals for such uses as hydrogen fuel storage and advance cancer-cell research. Is all this worth pursuing in space?
B. 表重要性的结构
Are Americans a nation of frivolous divorcers who selfishly pursue the bluebird of happiness, oblivious to their childrens needs? Divorce opponents like Judith Wallerstein seem to think most parents see divorce as a marvelous opportunity for the whole family. How immature do they think people are ?All over America, unhappy spouses lie awake at night wondering if they and their kids can afford divorce financially, socially, emotionally. Where will they live, how will they pay the bills, will the kids fall apart, will there be a custody battle, what will their families say? The very fact that so many people leave their marriage for a future with so many pitfalls proves that divorce is anything but a whim. Most people I know who split up spent years working up to it.
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