Word: hindes
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...Health Sciences came tantalizingly close. From the red blood cells of an adult frog, they raised a crop of lively tadpoles. These tadpoles were impressive creatures, remembers University of Minnesota cell biologist Robert McKinnell, who followed the work closely. "They swam and ate and developed beautiful eyes and hind limbs," he says. But then, halfway through metamorphosis, they died...
Berkeley's Padian, on the other hand, contends that pterosaurs did not have to walk on their wings, but were agile two-legged runners. He also disagrees with the explanation University of Bristol paleontologist David Unwin offers for the long fifth toe that juts out from pterosaur hind limbs. Unwin believes this toe served as the attachment site for a second skinlike membrane that stretched between the animals' hind limbs. "Why else would the fifth toe have been so elongated?" he asks. Padian responds that Unwin's membrane does not make anatomical sense: among other things, it would have hampered...
...Barbara Ehrenreich in her piece on vacationing in bear country [ESSAY, Aug. 12]. When I am out camping and hiking, every snapping twig in the dark is surely a grizzly. It's amazing how many stumps on the hiking trail look exactly like a bear rearing on its hind legs. I've read that on the trails you should alert the bears you are coming by talking, singing or wearing a bell on your backpack. I was not singing or ringing when my daughter and I recently hiked in the Los Padres National Forest. Sure enough, we surprised a black...
...experiment was brutally simple. Scientists from the Karolinska Institute in Sweden took 23 rats and neatly severed their spinal cords, paralyzing their hind legs. Then they took some of the injured rats and set about trying to repair the damage, using microsurgery to build hair-thin "bridges" across the spinal gap. It was an approach other scientists had tried in various forms for nearly 30 years, with little success. But this time, according to a report published last week in Science, it worked. Not only did the severed nerve fibers grow across the bridge, but the rats also began...
Then they waited. Not much happened for the first three months, as the animals dragged their back legs. Then one day, a few of them started to flex their hind muscles. Awkwardly at first, and then with growing strength, they began to crawl around. A year later, they could support their weight and move their rear legs, although they were still not walking normally...