Harmful chemical leaks in space station, AP
"We don't exactly know the nature of the spill ... but the crew is doing
well," said Mike Suffredini, NASA's space station program manager. "It's
not a life-threatening material."
"The crew first reported smoke but it turned out to be an irritant,
potassium hydroxide, leaking from an oxygen vent, Suffredini said."

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Gareth Slee