Foam cracks may delay shuttle launch

Foam cracks may delay shuttle launch - washingtonpost.com Highlights - MSNBC.com: "Recently discovered cracks in a foam 'ramp' on the space shuttle's external fuel tank may present an 'unacceptable safety threat' to the orbiter, raising the possibility that NASA could delay its next launch while engineers decide whether to get rid of the ramp altogether, shuttle program manager N. Wayne Hale said in an internal memo."