When Governor Davis signed a bill this week authorizing stem cell research in California，he set the stage for possible conflict with the federal government.Behind this polarized controversy，too often，
Adolescence is supposed to be full of ups and downs.But when the downs become persistent and obvious，it may signal a more serious psychological condition.Between 6% ~ 8% of American teenagers suffer f
Many critics of the current welfare system argue that existing welfare regulations lead to family instability.They believe that those regulations，which exclude most poor husband-and-wife families from
The income-tax deadline approaches and some taxpayers‘thoughts turn to it.Test time approaches and some students’thoughts turn to it.Temptation appears and some spouses consider it.Nowadays，cheating i
In this week’s Nature， a group of zoologists led by Andrew Whiten of the University of St Andrews in Scotland and Christophe Boesch of the Max Planck Institute for Evolutionary Anthropology in Leipzig
Hidden valley looks a lot like the dozens of other camps that dot the woods of central Maine. There’s a lake， some soccer fields and horses. But the campers make the difference. They’re all American p
The majority of successful senior managers do not closely follow the classical rational model of first clarifying goals, assessing the problem, formulating options, estimating likelihoods of success,
Archaeology as a profession faces two major problems. First, it is the poorest of the poor. Only paltry sums are available for excavating and even less is available for publishing the results and pres
Between the eighth and eleventh centuries A. D., the Byzantine Empire staged an almost unparalleled economic and cultural revival, a recovery that is all the more striking because it followed a long p
The fossil remains of the first flying vertebrates, the pterosaurs, have intrigued paleontologists for more than two centuries. How such large creatures, which weighed in some cases as much as a pilot