The lives of most men are determined by their environment. They accept the circumstances amid which fate has thrown them not only with resignation but even with good will. They are like streetcars running contentedly on their rails and they despise the sprightly flivver that dashes in and out of the traffic and speeds so jauntily across the open country. I respect them; they are good citizens, good husbands, and good fathers, and of course somebody has to pay the taxes; but I do not find them exciting. I am fascinated by the men, few enough in all conscience, who take life in their own hands and seem to mould it to their own liking. It may be that we have no such thing as free will, but at all events we have the illusion of it. At a crossroad it does seem to us that we might go either to the right or the left and, the choice once made, it is difficult to see that the whole course of the world’s history obliged us to take the turning we did.
He()lives in the house where he was born.
The old man lives(). He always feels().
He()lives here.
The old man lives(). He always feels().
High earners are more likely to feel satisfied with their lives probably because they realize they have good luck.
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The tapeworm is an example of (i) ______ organism, one that lives within or on another creature, (ii) ______ some or all of its nutrients from its host.
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Every year thousands of lives()in road accidents because of careless driving.
For centuries, explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic and nationalistic. Columbus went west to look for better trade routes to the Orient and to promote the greater glory of Spain, Lewis and Clark journeyed into the American wilderness to find out what the U.S. had acquired when it purchased Louisiana, and the Apollo astronauts rocketed to the moon in a dramatic show of technological muscle during the cold war.
Although their missions blended commercial and political-military imperatives, the explorers involved all accomplished some significant science by going where no scientists had gone before.
Today Mars looms as humanity’s next great terra incognita. And with doubtful prospects for a short-term financial return, with the cold war a rapidly fading memory and amid a growing emphasis on international cooperation in large space ventures, it is clear that imperatives other than profits or nationalism will have to compel human beings to leave their tracks on the planet’s reddish surface. Could it be that science, which has long played a minor role in exploration, is at last destined to take a leading role? The question naturally invites a couple of others; Are there experiment that only human could do on Mars? Could those experiments provide insights profound enough to justify the expense of sending people across interplanetary space?
With Mars the scientific stakes are arguably higher than they have ever been. The issue of whether life ever existed on the planet, and whether it persists to this day, has been highlighted by mounting evidence that the Red Planet once had abundant stable, liquid water and by the continuing controversy over suggestions that bacterial fossils rode to Earth on a meteorite from Mars. A more conclusive answer about life on Mars, past or present, would give researchers invaluable data about the range of conditions under which a planet can generate the complex chemistry that leads to life. If it could be established that life arose independently on Mars and Earth, the finding would provide the first concrete clues in one of the deepest mysteries in all of science: the prevalence of life in the universe.