June 30, 2012, 1pm PDT
James Trainor looks back at the history of New York's "adventure playgrounds" of the 1960s and 70s, tracing their origin back to the original Central Park dust-up between Robert Moses and local housewives.
August 29, 2011, 10am PDT
John B. Calhoun wrote in the 70s about studies he'd conducted that looked at how mice would react when "overcrowded". Since his utopias often turned ugly, he (and many others) extrapolated the results to humans, giving density a bad name.
October 4, 2010, 9am PDT
A Columbia professor finds an obscure 1856 document that created the legal precedents that allowed the United States to seize and hold islands, and it all ties back to bird poop.