Five Best Ideas of the Day
Published each weekday, at noon.
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This rocket’s launch — and safe return to earth — could open the door to space tourism.
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Doctors are 3D-printing a patient’s brain to practice surgery before they perform it.
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The next leap in clean energy? Algae-power.
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How data-mining led to a diabetes breakthrough.
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The police took more stuff from people than burglars did last year.