School children jump for science

At precisely 11 a.m. Friday, on playgrounds across the city and beyond, tens of thousands of school children started to jump. They wanted to see if they could make the earth move in response. The answer? Not really, according to Temple geologist Jonathan Nyquist who checked a seismometer at the school's Ambler campus. Nyquist said the impact of the Philadelphia jump was not immediately distinguishable from the daily tumult of city life. "There is a little something at 11. I can't tell you if that isn't a train going by or something else."
April 16, 2011 | Philadelphia Inquirer