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Astronauts anticipate more trips to the moon and manned missions to Mars, but exposure to cosmic radiation outside the Earthâ€™s magnetic field could be detrimental to their arteries.
Word of the Day
- A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.
The word 'pawl' probably comes from a Latin word meaning 'stake'.