The lander Moon Express showed off Thursday is powered by compressed oxygen, for now, as Moon Express employees test it at a NASA facility in Mountain View, California.

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In this week's test, examiners set ablaze five boxes containing about 250 oxygen canisters swathed in bubble wrapper to determine how long it would take the fire to spread.

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One finding: The type of heart problem that caused cardiac arrest in most of the survivors blood vessels that were too narrow to meet the oxygen demands of the heart during an intense running race can be caught by an exercise stress test.

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