NASA is inviting the public to send questions for its astronauts via Twitter during the space shuttle Endeavour's upcoming mission to the International Space Station. Astronaut Mike Massimino will take questions for the crew from the public via his Twitter account until Thursday, February 11. Massimino will be a spacecraft communicator, at NASA's Mission Control in Huston during Endeavour's flight, scheduled for launch February 7. At 2:24 a.m. CST on February 11,