Word: signallers
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...squalls that have traditionally taken forecasters by surprise. By bouncing microwaves off the tiny droplets in the center of a cloud and picking up the echoes, Doppler systems can map the relative velocity of wind currents within the cloud. High-velocity winds and a high level of organization can signal the formation of a mesocyclone -- a precursor to a full-fledged tornado...
Unlike earthquakes, which often happen without warning, impending volcanic eruptions generally signal their arrival. Before a blowup, instruments can detect a series of tremors in the mountain, which indicate that molten rock, called magma, is coming up from deep inside the earth. The magma rises gradually, opening fissures that serve as its pipelines to the surface. What happens next depends on the composition of the magma. If it is fairly liquid, it generally produces a stately lava flow that poses more of a threat to property than to humans. Hawaiian volcanoes tend to follow this pattern...
...wanted to go into a black hole," says Theoharis. "[The protests] made Harvard seem more welcoming and set off the institutional apathy. It sent a real signal...
Injuries have continued to haunt Jones. Last Christmas break, she tore a tendon in her knee. She failed to qualify for nationals in cross country and would not don a Crimson jersey again, constantly aggravating the injury during spring workouts. But Jones does not feel these injuries signal the end of her running career...
...like a pall, many of the nation's big retail outlets are beginning to resemble mausoleums. Merchandise sales are dismally flat this year. Still, not every store is an echo chamber. A few novel retailing ideas have captured the attention of otherwise moribund buyers. The success of some may signal that shopping preferences and rituals are changing, while others may be nothing more than passing fads. As the great philosopher Confucius -- yes, Confucius! -- once said, "To open a shop is easy; to keep it open is an art." Here are three works of modern retailing art that are bucking...