Word: doings
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Dates: during 1990-1999
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The idea of implanting brain stem cells, while not as dramatic as swapping whole brains, also raises intriguing philosophical questions. "Sometimes at seminars when I talk about my work," says Snyder, "somebody will ask me whether the introduction of these stem cells will alter memory." Do the newly generated cells...
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...
But that's just the beginning. Within a few decades, nanotechnologists predict, they will be creating machines that can do just about anything, as long as it's small. Germ-size robots will not just measure internal vital signs; they will also organize the data with molecular microcomputers and broadcast...
Also close to reality are the so-called antiangiogenic factors, relatively nontoxic compounds that inhibit the growth of new capillaries. The idea behind this new class of drugs is that tumors cannot grow bigger than a few hundred thousand cells--about the size of a peppercorn--without growing their own...
It is worth noting, however, that in much of the biological world, cloning is old hat. There are some species, such as those dandelions and whiptail lizards, that reproduce no other way, and there are many, such as aphids and strawberries, that switch effortlessly between sex and cloning. There are...