Only a year ago, Harvard had a $36.9 billion endowment, the largest in academia. Now that endowment has imploded, and the university faces the worst financial crisis in its 373-year history. Could the same lethal mix of uncurbed expansion, colossal debt, arrogance, and mismanagement that ravaged Wall Street bring down America’s most famous university? And how much of the turmoil is the fault of former Harvard president Larry Summers, now a top economic adviser to President Obama? As students demonstrate, administrators impose Draconian cuts, and construction is halted on an over-ambitious $1.2 billlion science complex, Nina Munk follows the finger pointing…