... American science, long a source of national power and pride, is increasingly becoming a private enterprise. In Washington, budget cuts have left the nation’s research complex reeling. Labs are closing. Scientists are being laid off. Projects are being put on the shelf, especially in the risky, freewheeling realm of basic research. Yet from Silicon Valley to Wall Street, science philanthropy is hot, as many of the richest Americans seek to reinvent themselves as patrons of social progress through science research. ... Fundamentally at stake, the critics say, is the social contract that cultivates science for the common good. They...