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Working with antibiotic-resistant bacteria, a new study by evolutionary biologists at Harvard suggests that a vast majority of evolutionary pathways for organisms are closed off by natural selection. Daniel M. Weinreich, a post-doctoral fellow in the Department of Organismic and Evolutionary Biology, headed a study—published in the journal Science last week—of the development of antibiotic resistance in E. coli. In particular, the scientists studied five point mutations that increases anti-biotic resistance in bacteria by five orders of magnitude. Since the overall mutation requires five sequential steps, there are 120 pathways from...
...Center for Latino Arts (CLA) in Boston are jointly exhibiting “Retouched: The Photographs of Baldomero Alejos.” The majority of Alejos’ work was studio portraiture, on display at CLA. In his time away from his studio, however, Alejos created a vast photographic archive of the events and people of rural Ayacucho, of which 41 prints will be on view at DRCLAS for the rest of the semester...
...flight comfort with an internet connection in every seat Take a Hike Destinations to restore your sense of wonder 18th century Baixa Pombalina district on the banks of the Tagus River. Through the Rua Augusta arch you see Praça do Comercio, the colonnaded square built on the vast open space left by the 1755 earthquake and tsunami. Then, having climbed up the smart Chiado district with its old coffee shops, the tram clangs through the 17th century streets of the Bairro Alto. Before reaching the São Bento parliament building, you pass the Bica, a deep cleft...
...hard for Americans to fathom a world in which corporations, instead of merely lamenting the shortage of skilled labor, volunteer to train vast numbers of the non-college-bound. Oh, yeah, and to pay them a bundle along the way. But under Germany's earn-while-you-learn system, companies are paying 1.6 million young adults to train for about 350 types of jobs, ranging from industrial mechanic to baker to fitness trainer. And the trainees' average annual salary of $19,913 helps explain why less than 9% of Germans drop out of high school: they...
...turns out, isn't the only side of the border where illegal immigration is a hot-button issue. It weighs heavily in Mexico's impoverished central and southern regions, where the vast majority of the country's indocumentados - several hundred thousand a year - start out before entering the U.S. And it's a big reason why L?pez, the former mayor of Mexico City, leads in voter polls - much to the chagrin of the Bush Administration, which faces the prospect of a L?pez victory bringing Latin America's stunning recent shift to the political left to America's doorstep...