The former Treasury secretary was looking up from behind a long desk at his audience — a few dozen Harvard undergraduates, members of Larry Summers’s economics course, sitting in elevated rows of chairs and staring back at him like senators at a Capitol Hill hearing. Geithner, 52, is 5-foot-9 with a naturally boyish look that he maintains in part by running six miles several mornings each week. He looked hardly older than the teaching assistants in the front row.

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