Word: contrastes
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...hypothesis Knoll favors invokes the competition between two classes of compounds for control of the biochemical environment, one based on oxygen and the other on sulfide. During most of the Proterozoic, it turns out, only the shallows were infused with oxygen. The deep oceans, by contrast, were inordinately rich in sulfides, which indirectly interfere with the ability of algae to make use of growth-promoting nitrogen...
...contrast, two other groups chose a more provocative path. In July of this year, the Jones Institute for Reproductive Medicine in Norfolk, Va., made headlines by announcing that it had created embryos (from donated sperm and eggs) expressly to extract their stem cells. A few days later, a Massachusetts biotech firm, Advanced Cell Technology, disclosed that it was trying to create embryos using human-cloning techniques. The back-to-back developments surprised opponents and supporters alike, and brought new calls for a ban on all embryonic stem-cell research...
...center of the backpacker world is the Thai island of Koh Pha-Ngan. Evidence of the crushing weight of the 10,000 people who dance each full moon away lies a few yards offshore from the Hadrin Beach party zone. In contrast to the spectacular fish and coral found elsewhere, the waters are lifeless. The only color to be seen under the waves comes from the luminous green of a beer can or the white from a Styrofoam takeout box. Onshore, as the sun goes down, the beach could barely be more alive. Crowds of backpackers squeeze into seven beachfront...
Throughout the journey, I was struck by the contrast between the beauty of the landscape and the ugliness of the people. I saw the hatred of the Han Chinese toward the Muslim minorities in western Gansu province. I saw a man being castrated and his house ransacked by a village family-planning brigade, because his wife had just given birth to a second child. Years of political oppression had left the Chinese people hostile and suspicious of outsiders. When I passed through remote villages, peasants would take me for a spy or a hooligan and report me to the police...
...nineteenth century doesn't figure in our current discussion, although there would doubtless be much to be learned if we were to compare and contrast the whiskers of John Brown, Robert E. Lee, Ulysses Grant, and Abraham Lincoln...