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Some scientists contend that many species of dinosaur had a metabolism more like a warm-blooded mammal's than a cold-blooded reptile's.
Approved April 24, 1800, the act of Congress that made provision for the removal of the government of the United States to the new federal city, Washington, D .C ., also established the Library of Congress.
In the mid-1920s the Hawthorne Works of the Western Electric Company was the scene of an intensive series of experimentsinvestigating the effects that changes in working conditions would have on workers' performance
The health benefits of tea have been the subject of much research; besides possibly preventing or inhibiting some forms of cancer, the brewed leaves of Camellia sinensis may also play a role in reducing the risk of heart disease and stroke.
Retailers reported moderate gains in their November sales, as much because.their sales a year earlier had been so bad as because shoppers were getting a head start on buying their holiday gifts.
In 1852 Robert Angus Smith published a detailed report of the chemistry of rain kin a large area around the city of Manchester, England, noting.that the city air became increasingly acidic后面又是独立主格 the closer one came to town正确
In the shark's jaws, many spare teeth lie in seemingly limitless reserve, each one ready to slide into the appropriate position whenever an active tooth is lost or worn down.
In some species of cricket, the number of chirps per minute used by the male.to attract females rises and falls in accordance with the surrounding temperature, and it can in fact serve as an approximate thermometer.
Over the next few years, increasing demands on the Chattahoochee River, which flows into the Apalachicola River, could alter the saline content of Apalachicola Bay, .robbing the oysters there of their flavor and making them smaller, less distinctive, and less in demand.
More than fifty years after the Second World War, a number of African American soldiers were awarded - some of them posthumously - the Congressional Medal of Honor, the nation's highest military award, in long-overdue
recognition of their outstanding bravery.
Sound can travel through water for enormous distances, .its acoustic energy prevented from dissipating by boundaries in the ocean created by water layers of different temperatures and densities.
Shoppers in sporting goods stores, unlike those in department stores, do very little impulse shopping; someone who comes in for a basketball will leave with a basketball only and not buy a pair of skis and a boomerang as well
Scientists have observed large concentrations of heavy metal deposits in the upper twenty centimeters of .sediments from the Baltic Sea, findings consistent with the growth of industrial activity in the area
Three out of every four automobile owners in the United States also own a bicycle.
For the farmer who takes care to keep them cool, .provided with high-energy feed, and milked regularly, Holstein cows will produce
A recent review of pay scales indicates that, on average, CEO's now earn 419 times the pay of blue-collar workers, as compared to 42 times their pay, the ratio in 1980.
At the annual stockholders meeting, investors heard a presentation on the numerous challenges facing the company,among them the threat of a rival's multibillion-dollar patent-infringement suit and the decline in sales of the company's powerful microprocessor chip.
Between 1990 and 2000 the global economy grew more than it did during the 10,000 years from the beginning of agriculture to 1950.
.Despite the increasing number of women graduating from law school and passing bar examinations, .the proportion of judges and partners at major law firms who are women has not risen comparably
.As an educator, a builder of institutions and organizations, and a major figure in the Black church and secular feminist movements, Nannie Helen Burroughs was one of the best-known and most well-respected African Americans of the early twentieth century.
The Kwakiutl recognized one social unit larger than the tribe--the confederacy, which was a cluster of loosely knit, informally related neighboring tribes who interacted with one another more often than with other tribes.
The Anasazi settlements at Chaco Canyon were built on a spectacular scale with more than 75 carefully engineered structures, of up to 600 rooms each, connected by a complex regional system of roads.
The fact that elk now live almost solely in the Rocky Mountains would make it seem that they are mountain dwellers, but they once ranged over virtually all of the continental United States except for a small strip in the extreme Southwest.
To meet the rapidly rising market demand for fish and seafood, suppliers are growing fish twice as fast as they grow naturally, cutting their feed allotment by nearly half and raising them on special diets.
As Charles Darwin observed, natural selection operates whenever individuals of one genetic composition are better at reproducing than those of another
South American bird that forages for winged termites and other small insects while swinging upside down form the foliage of tall trees, the graveteiro belongs to the ovenbird family, a group of New World tropical birds that includes more than 230 species and is represented in virtually every kind of habitat.
The soft drink company's flat earnings for the second quarter reflect both the success of its restructured global bottling system and the extent to which poor currency exchange rates are keeping down profits for multinational companies.
With charcoal's being replaced by coal as the fuel used in the smelting of iron ore and several improvements in blowing machinery, the average output of ironwork tripled over the eighteenth century.
Possible long-term consequences of the "greenhouse effect," the gradual warming of the Earth's climate,include melting of the polar ice caps and a rise in sea level
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Between 1990 and 2000 the global economy grew more than it did during the 10,000 years from the beginning of agriculture to 1950.
Since 1975so many people have been moving to Utah that the Mormons, who once represented 75 percent of the population, now account for only half
In 1994 the white house named Dr RuthR. Faden chairperson of the federal advisory committee of experts it assigned to do a report on the history and ethics of the government's radiation experiments on humans in the 1950's and1960's.
Although the lines of competition are clearly defined in industries that are more established, they are blurred and indistinct in the Internet industry, as competing companiesone day may be partners the next.
Discussion of greenhouse effects has usually focused on whether the earth would warm and by how much, but climatologists have indicated all along that the most obvious effects, and those that would have the largest impact on people, would be extremes of temperature, precipitation, and storminess.
Researchers are using computer images to help surgeons plan difficult operations and to develop programs that will work for doctors and nurses in the same way that flight simulators do for pilots, letting medical personnel practice their techniques and test their reflexes before they ever see a patient.
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发表于 2013-4-7 11:41:37
