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Education reformers have long called for U.S. kids to log more time in the classroom so they can catch up with their peers elsewhere in the world, but resistance from leisure-loving teenagers isn't the only reason there is no mass movement to keep schoolchildren in their seats. Such a change could cost cash-strapped state governments and local school districts billions of dollars, strip teachers of a time-honored perk of their profession, and irk officials in states that already bridle at federal intrusion into their traditional control over education.

Texas already forbids school from starting before the fourth Monday of August, a provision designed to save money on utility bills and increase business for tourist destinations and other summer attractions. "Ultimately the states, not the federal government, should have the final word on this and other public school decisions," said Lucy Nashed, a spokeswoman for Gov. Rick Perry. In Kansas, sporadic efforts by local districts to extend the school year at even a few schools have been met by parental resistance, said state education commissioner Diane DeBacker.

There, Hall objected vehemently to the emphasis on teaching traditional subjects, e.g., Latin, mathematics, science and history, in high school, arguing instead that high school should focus more on the education of adolescents than on preparing students for college.

Hall believed that humans are by nature non-reasoning and instinct driven, requiring a charismatic leader to manipulate their herd instincts for the well-being of society. He predicted that the American emphasis on individual human right and dignity would lead to a fall that he analogized to the sinking of Atlantis.

Hall coined the phrase "storm and stress" with reference to adolescence, taken from the German Sturm und Drang movement. Its three key aspects are conflict with parents, mood disruptions, and risky behavior.

If the company could monitor sales of ice cream - or bottled water or sun tan cream - on hot days like this one and then gauge future demand, he said, it could alter the way the company behaved

Real-time - the act of responding to events as they happen - is changing the way that the world behaves.

The software has also been blamed for exacerbating the financial crisis. Computer programmes automatically sold stocks as fear spread in the markets, because their algorithms have built-in "sell" orders.

The premise of the work is simple — get to know your potential customers as well as possible before you make a product for them. But when those customers live, say, in a mud hut in Zambia or in a tin-roofed hutong dwelling in China, when you are trying — as Nokia and just about every one of its competitors is — to design a cellphone that will sell to essentially the only people left on earth who don’t yet have one, which is to say people who are illiterate, making $4 per day or less and have no easy access to electricity, the challenges are considerable.

Text messaging, or S.M.S. (short message service), turns out to be a particularly cost-effective way to connect with otherwise unreachable people privately and across great distances. Public health workers in South Africa now send text messages to tuberculosis patients with reminders to take their medication. In Kenya, people can use S.M.S. to ask anonymous questions about culturally taboo subjects like AIDS, breast cancer and sexually transmitted diseases, receiving prompt answers from health experts for no charge.

A cellphone in the hands of an Indian fisherman who uses it to grow his business — which presumably gives him more resources to feed, clothe, educate and safeguard his family — represents a textbook case of bottom-up economic development, a way of empowering individuals by encouraging entrepreneurship