US space shuttle Endeavour blasted off from the Kennedy Space Centre in Florida on Monday, kicking off its 25th and the last space mission in history, which draws great attention from media worldwide. Chinese journalists were denied the opportunity to make live coverage of the shuttle's blast-off, just as their peers from other countries have done. The Chinese journalists were also kept away from NASA's press conferences. Obviously, the "Wolf Clause" runs counter to the trend that both China and the United States are trying to push ahead their exchanges and cooperation in science and technology. Read more