Shuttle Inquiry Focusing on Tank Foam 35 minutes ago Add Science - AP to My Yahoo! By MARCIA DUNN, AP Aerospace Writer SPACE CENTER, Houston - Just how the foam insulation was applied to the fuel tanks of NASA (news - web sites)'s space shuttles is getting special attention by the board investigating the Columbia accident, officials said Thursday. AP Photo Space Shuttle Columbia Special Coverage One leading theory is that the insulation or the heavier material beneath may have damaged Columbia during liftoff, enough to trigger a deadly breach as the spaceship hurtled toward a Florida landing 2 1/2...