Dr. Arno Penzias, who helped confirm Big Bang Theory, dies at 90
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Doomsday Clock stays at 90 seconds to midnight for second straight year
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Scientists raise alarms about controversial bite marks analysis used in convictions
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NASA straps dreams of 2024 moon mission to SpaceX rockets
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Brain implant uses AI to give speech-disabled patients a voice
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Pedal pushers power concert in Italy
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The town of Bari, Italy, puts on a concert with music lovers hopping on 128 energy-generating bicycles to power the show. TODAY.com's Dara Brown reports.Sept. 16, 2011
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