Seventh grade science students react as a fellow pupil re-creates the effects of a volcano, by popping the cap of a plastic bottle after shaking it full of vinegar and baking soda, before a visit to the class by U.S. President George W. Bush at the Harlem Village Academy Charter School in New York April, 24, 2007. Bush came to New York to push for the reauthorization of his signature education policy, the "No Child Left Behind" act. REUTERS/Jason Reed (UNITED STATES)