60Bird wings have a much more complex job to do than the wings of an airplan... [查看全文]
59Writing to learn makes it possible to show learning in writing. Much of the... [查看全文]
58In the past oysters were raised in much the same way as dirt farmers raised... [查看全文]
57Futurists have identified two changes that seem to be central to contemporary... [查看全文]
56The energy crisis, which is being felt around the world, has dramatized how ... [查看全文]
55Security and commodity exchanges are trading posts where people meet who wish... [查看全文]
54Governments that want their people to prosper in the burgeoning world economy... [查看全文]
53More than half of all Jews married in U.S. since 1990 have wed people who ... [查看全文]
52Where one stage of child development has been left out, or not sufficiently ... [查看全文]
51Each year, millions of people in Bangladesh drink ground water that has been... [查看全文]