Two science teachers who have spent the past five years under NASA's tutelage are about to graduate with high-flying honors.

The space shuttle flight of Joseph Acaba and Richard Arnold II, scheduled for March 11, will mark the first time two former teachers have rocketed into space together. And during the two-week construction mission to the international space station, both will attempt multiple spacewalks--the most dangerous job in orbit.

The flight on shuttle Discovery was delayed a month because of concerns about hydrogen-gas valves in the engine compartment. After extra tests, NASA deemed the spacecraft safe to fly.

The teachers and their five...

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