Former Secretary of State Colin Powell said America must not allow post-9/11 security concerns to cost the country its sense of openness. Powell spoke to about 3,000 students, alumni and others Thursday night at Kutztown University’s Keystone Arena. ”Terrorists can bomb our buildings and down airliners in Pennsylvania fields, but they cannot change us,” he said. ”Only we can do that.” Powell, 69, said as secretary of state he was instrumental in enacting security measures following the Sept. 11, 2001, terrorist attacks, including a tightening of visas. But he said he warned President Bush against going too far. Full Story