2019年06月18日 15:36:01|来源:国际在线|编辑:飞度医院排名
A Rare Fossil Record A Rare Fossil RecordThe preservation of embryos and juveniles is a rate occurrence in the fossil record. The tiny, delicate skeletons are usually scattered by scavengers or destroyed by weathering bee they can be fossilized. Ichthyosaurs had a higher chance of being preserved than did terrestrial creatures because, as marine animals, they tended to live in environments less subject to erosion. Still, their fossilization required a suite of factors a slow rate of decay of soft tissues, little scavenging by other animals, a lack of swift currents and waves to jumble and carry away small bones, and fairly rapid burial. Given these factors, some areas have become a treasury of well-preserved ichthyosaur fossils.The deposits at Holzmaden, Germany, present an interesting case analysis. The ichthyosaur remains are found in black, bituminous marine shales deposited about 190 million years ago. Over the years, thousands of specimens of marine reptiles, fish and invertebrates have been recovered from these rocks. The quality of preservation is outstanding, but what is even more impressive is the number of ichthyosaur fossils containing preserved embryos. Ichthyosaurs with embryos have been reported from 6 different levels of the shale in a small area around Holzmaden, suggesting that a specific site was used by large numbers of ichthyosaurs repeatedly over time. The embryos are quite advanced in their physical development; their paddles, example, are aly well med. One specimen is even preserved in the birth canal. In addition, the shale contains the remains of many newborns that are between and 30 inches long.Why are there so many pregnant females and young at Holzmaden when they are so rare elsewhere? The quality of preservation is almost unmatched and quarry operations have been carried out carefully with an awareness of the value of the fossils. But these factors do not the interesting question of how there came to be such a concentration of pregnant ichthyosaurs in a particular place very close to their time of giving birth. 96Extend the Miraclemy skills, my mind, my heart, and my body will stagnate, rot, and die lest I put them to good use. I have unlimited potential. Only a small portion of my brain do I employ; only a paltry amount of my muscles do I flex. A hundredfold or more can I increase my accomplishments of yesterday and this I will do, beginning today. Nevermore will I be satisfied with yesterday's accomplishments nor will I indulge, anymore, in self-praise deeds which in reality are too small to even acknowledge. I can accomplish far more than I have, and I will, why should the miracle which produced me end with my birth? Why can I not extend that miracle to my deeds of today? And I am not on this earth by chance. I am here a purpose and that purpose is to grow into a mountain, not to shrink to a grain of sand. Henceth will I apply all my efts to become the highest mountain of all and I will strain my potential until it cries mercy. I have been given eyes to see and a mind to think and now I know a great secret of life I perceive, at last, that all my problems, discouragements, and heartaches are, in truth, great opporties in disguise. I will no longer be fooled by the garments they wear mine eyes are open. I will look beyond the cloth and I will not be deceived. 8300这些日子我越来越回想起父亲的话我们需要他那样的信仰,我们祖先的信仰;我们需要一种信仰鞭策自己投身于比发展自身与积聚私产更重要的事业只有具备这种信仰,我们才能在世界历史最关键的时期决定国家的命运My Father’s Evening Star by William O. Douglas During moments of sadness or frustration, I often think of a family scene years ago in the town of Yakima, Washington. I was about seven or eight years old at the time. Father had died a few years earlier. Mother was sitting in the living room talking to me, telling me what a wonderful man Father was. She told me of his last illness and death. She told me of his departure from Cleveland, Washington, to Portland, Oregon, what proved to be a fatal operation. His last words to her were these “If I die it will be glory, if I live it will be grace.” I remember how those words puzzled me. I could not understand why it would be glory to die. It would be glory to live, that I could understand. But why it would be glory to die was something I did not understand until later.Then one day in a moment of great crisis I came to understand the words of my father. “If I die it will be glory, if I live it will be grace.” That was his evening star. The faith in a power greater than man. That was the faith of our fathers. A belief in a God who controlled man in the universe, that manifested itself in different ways to different people. It was written by scholars and learned men in dozens of different creeds. But riding high above all secular controversies was a faith in One who was the Creator, the Giver of Life, the Omnipotent.Man’s age-long eft has been to be free. Throughout time he has struggled against some m of tyranny that would enslave his mind or his body. So far in this century, three epidemics of it have been let loose in the world.We can keep our freedom through the increasing crisis of history only if we are self-reliant enough to be free—dollars, guns, and all the wondrous products of science and the machine will not be enough. “This night thy soul shall be required of thee.”These days I see graft and corruption reach high into government. These days I see people afraid to speak their minds because someone will think they are unorthodox and theree disloyal. These days I see America identified more and more with material things, less and less with spiritual standards. These days I see America drifting from the Christian faith, acting abroad as an arrogant, selfish, greedy nation, interested only in guns and dollars, not in people and their hopes and aspirations. These days the words of my father come back to me more and more. We need his faith, the faith of our fathers. We need a faith that dedicates us to something bigger and more important than ourselves or our possessions. Only if we have that faith will we be able to guide the destiny of nations, in this the most critical period of world history.作者简介William O. Douglas was an associate justice of the U.S. Supreme Court from 1939 to 1975. As a boy, he hiked the Cascade Mountains near his home in Washington to strengthen legs weakened by polio. His prolific career on the bench was marked by controversy and two attempts to impeach him. 999

Bacteria Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters, bacterial size is measured in microns. One micron is a thousandth of a millimeter a pinhead is about a millimeter across. Rod-shaped bacteria are usually from two to four microns long, while rounded ones are generally one micron in diameter. Thus if you enlarged a rounded bacterium a thousand times, it would be just about the size of a pinhead. An adult human magnified by the same amount would be over a mile(1.6 kilometer) tall. Even with an ordinary microscope, you must look closely to see bacteria. Using a magnification of 0 times, one finds that bacteria are barely visible as tiny rods or dots. One cannot make out anything of their structure. Using special stains, one can see that some bacteria have attached to them wavy-looking "hairs" called flagella. Others have only one flagellum. The flagella rotate, pushing the bacteria through the water. Many bacteria lack flagella and cannot move about by their own power, while others can glide along over surfaces by some little- understood mechanism. From the bacteria point of view, the world is a very different place from what it is to humans. To a bacterium water is as thick as molasses is to us. Bacteria are so small that they are influenced by the movements of the chemical molecules around them. Bacteria under the microscope, even those with no flagella, often bounce about in the water. This is because they collide with the watery molecules and are pushed this way and that. Molecules move so rapidly that within a tenth of a second the molecules around a bacteria have all been replaced by new ones; even bacteria without flagella are thus constantly exposed to a changing environment. 9

Resolve to be tender with the young, compassionate with the aged, sympathetic with the striving, and tolerant with the weak and the wrong. Sometime in life you will have been all of these.要对年轻人温和些,对老人有同情心,体谅正在拼搏的人,宽容弱者和错误因为生活中,有时候我们也会成为这些人中的任何一个

Life is either a daring adventure or nothing. To keep our faces toward change and behave like free spirits in the presence of fate is strength undefeatable. 56

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