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All Things Considered

Unlike most dairy cows in America, which are descended from just two bulls, this cow at Pennsylvania State University has a different ancestor: She is the daughter of a bull that lived decades ago, called University of Minnesota Cuthbert. The bull's frozen semen was preserved by the U.S. Agriculture Department. Dan Charles/NPR hide caption

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Dan Charles/NPR

The Salt

Most U.S. Dairy Cows Are Descended From Just 2 Bulls. That's Not Good

The drive to make more milk has had an unsavory side effect: Cows have become more genetically similar and less fertile. Scientists are trying to recover valuable genetic variation that was lost.

Albatros Heimermann, Fred Heimermann et. al.
Good Night Berlin Abisko Lights

Instrument Deployment Camera on Mars InSight lander showing scoop "pinning" thermal instrument called the mole. NASA/Caltech-JPL hide caption

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NASA/Caltech-JPL

NASA Scientists Have A New Way To Try And Free InSight Lander That's Stuck On Mars

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Life on Mars? [2016 Mix] David Bowie
I Never Learn Lykke Li
August 10 Khruangbin
Outsiders Franz Ferdinand
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Everything is Moving, But Not the Sky Need A Name

Unlike most dairy cows in America, which are descended from just two bulls, this cow at Pennsylvania State University has a different ancestor: She is the daughter of a bull that lived decades ago, called University of Minnesota Cuthbert. The bull's frozen semen was preserved by the U.S. Agriculture Department. Dan Charles/NPR hide caption

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Dan Charles/NPR

Most U.S. Dairy Cows Are Descended From Just 2 Bulls. That's Not Good

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Los Santos At Night The Alchemist, Woody Jackson et. al.
Congratulations MGMT
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The End Shlohmo
Thoughts Nick Box
Inspiration Quart

JoJo Rabbit follows a young German boy (Roman Griffin Davis, left) growing up in the Third Reich with his imaginary friend, Adolf Hitler (Taika Waititi, right). Kimberley French/Twentieth Century Fox hide caption

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Kimberley French/Twentieth Century Fox

'Jojo Rabbit,' Your Reich Is Calling

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Komm, gib mir deine Hand The Beatles
Moving On Anna of the North

Former Texas Gov. Rick Perry takes a seat before the Senate Energy and Natural Resources Committee hearing on his nomination to be energy secretary on Jan. 19, 2017. Yuri Gripas/AFP/Getty Images hide caption

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Yuri Gripas/AFP/Getty Images

Energy Secretary Rick Perry To Resign

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All Things Considered