Word: stems
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...Like the three-year-old Harvard Stem Cell Institute (HSCI), the department will be focusing in large part on stem-cell biology. But the new department will have a somewhat different purview, including the instruction of undergraduates...
...Dream Process, the Harvard pair challenged Freudian theory on virtually every point. They argued that dreams are nonsense created when the forebrain makes "the best of a bad job in producing even partially coherent dream imagery from the relatively noisy signals" sent up to it from the brain stem at the onset of REM. Their paper served to yank dreaming from the realms of the psychological and plonk it in a dreary, physiological bucket...
...compared to a quarter of an adult's. The body craves it: when cut short in experiments REM returns more insistently in subsequent periods of sleep. Neuroimaging has told us a lot about the dreaming-or at least the REM-brain. Those areas that are active include the brain stem (responsible for basic functions like heartbeat regulation), the limbic system (which mediates emotions, learning and memory) and parts of the forebrain involved in processing sensory information. Shut down, meanwhile, are the bits responsible for the most sophisticated mental processes, such as logical and ordered thought. It's a profile that...
...that dreaming occurred outside periods of REM, that it was also common at sleep onset and shortly before waking in the morning. But he found an even weaker spot in the Hobson-McCarley hypothesis. If their theory was right, then people with damage to a part of the brain stem called the pons-the on-off switch for REM sleep-shouldn't be having dreams. Solms, however, had five patients with lesions in precisely that region, and while they weren't having REM, they were nonetheless reporting dreams...
...Numbers HEALTH 3 Width, in cm, of disks of human heart-valve tissue British scientists say they have generated from stem cells-by far the most complex tissue ever grown artificially 10 Number of years the researchers estimate it will take before they can grow a heart from stem cells...