Word: whose
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Dates: during 1990-1999
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...clock but as a scenario, which we can hope to edit." If we died in old age at the same rate we die between ages 10 and 15, then most of us in the U.S. would live 1,200 years. We would outdo the first Methuselah, whose years were...
...Snyder announced in print that his lab had removed stemlike cells from mouse brains and had grown them in a culture. Snyder then teamed up with Dr. Jeff Macklis, a colleague at Harvard Medical School who had engineered a strain of mouse whose neurons died off in a tiny region of the cortex where cells were not known to regenerate. Snyder injected the stem cells into the mice. Like heat-seeking missiles, the cells rapidly sought out the injured part of the cortex and transformed themselves into healthy neurons. "That's the beauty of stem cells," says Snyder...
Much of what is behind the new hope is a better understanding of why the cord doesn't heal itself. In 1988 neuroscientist Martin Schwab of the University of Zurich isolated substances in the central nervous system whose sole purpose appears to be to block growth. In a healthy spine, the chemicals establish boundaries that regulate cell growth. After an injury, they do little but harm. In recent years, however, Schwab has developed antibodies that neutralize the growth blockers, allowing regeneration to occur...
This realization has transformed cancer, in little more than a decade, from an utterly mysterious disease into a disorder whose molecular machinery is largely understood. Now cancer biologists are in the midst of their second epiphany: the recognition that tumors evolve, in Darwinian fashion, as each succeeding generation of cancer cells accumulates genetic mutations. "Survival of the fittest applies to cancer cells," says Richard Schilsky, associate dean for clinical research at the University of Chicago. "We now think of cancer not as a disease but as a genetic process...
...trouble, according to one theory, is that our best intentions about weight control go up against several million years of human evolution. Our hunter-gatherer ancestors literally didn't know where their next meal was coming from. So evolution favored those who craved energy-rich, fatty foods--and whose metabolism stored excess calories against times of famine. Love handles, potbellies, thick thighs are all part of Mother Nature's grand design...