Win Rosenfeld

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Video: Presidentiality: Are colleges encouraging atheism?

Are colleges anti-religion? Our “Presidentiality” series examines a claim by Newt Gingrich and Rick Santorum that higher education breeds secularism.

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Video: Economics lesson: The student-debt dilemma

With student loan debt now nearing $1 trillion, Need to Know looks at the dilemma facing young people: go to college and likely accumulate tens of thousands of dollars in debt, or skip it and risk never qualifying for a higher-paying job.

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Video: Playing the field: Ethanol in Iowa

Need to Know correspondent Win Rosenfeld discovers how the presidential candidates are no longer committing to ethanol subsidies — a once-unthinkable position for a candidate seeking votes in Iowa.

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Video: Presidentiality: The science behind Rick Perry’s brain freeze

Rick Perry suffered from a potentially campaign-wrecking lapse of memory at the Republican debate this week. Presidentiality looks at the science behind Perry’s embarrassing brain melt.

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Video: Presidentiality: Herman Cain and the electrified fence

GOP presidential candidate Herman Cain wants to build an electrified fence on the U.S.-Mexico border that could “kill” illegal immigrants. But as history shows, immigrants have braved much worse in pursuit of a new and better life on American soil.

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Video: Presidentiality: ‘Dr. Keynes’

Republicans have come to revile the famed economist John Maynard Keynes, revealing a rift between how Democrats and the GOP view the economic crisis.

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A talk on the dark side with Brian Greene

Three American scientists specializing in dark energy were awarded the Nobel Prize in physics today. Win Rosenfeld talks to Brian Greene about why dark energy has been a top priority for the astrophysics community in recent years.

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Video: Presidentiality: ‘Class warfare?’

Republicans are accusing Obama of waging “class warfare.” But America’s fights over class and wages have been much worse — and much bloodier — in years past.

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Video: Presidentiality: ‘Revenge!’

Why do we cheer for the death penalty? After an incident at a recent Republican debate, Presidentiality looks back at thousands of years of evolution, to understand why human beings get off on retribution.