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China's "Tianhe-2" (Milky Way 2) supercomputer took first place in one recent speed test, clocking in at 30 quadrillion calculations per second--about twice as fast as the best American machines. The U.S. still has more supercomputers than any other nation, but some experts say computer speed is a measure of a country's scientific innovation, and worry the U.S. is lagging behind.

By KWGS News/National Weather ServiceTulsa, OK – ...PRELIMINARY SNOW ACCUMULATION SUMMARY FEB 09 2011......REPORTS SORTED BY AMOUNTS...IN OKLAHOMA...21.00…

NPR's Steve Inskeep asks author Barry Levine about the subpoenas issued by the Republican-led House for depositions from former top officials, including the Clintons, on the investigation into Jeffrey Epstein.

With Mitt Romney ever closer to nailing down the delegates he needs for the Republican presidential nomination, what is his next closest rival — Rick Santorum — to do? Audie Cornish talks to top Santorum strategist John Braebender.

We've got tips for locating a great instructor, including questions you should ask before the first lesson.

A recent report by the research project found that one in three Americans raised in the middle class fall out of it as adults. Host Audie Cornish speaks with Erin Currier of the Pew Charitable Trusts' Economic Mobility Project about pressures on the American middle class.

About half of Americans own stock, though most stocks are owned by the wealthiest. For many, a booming stock market does not offer direct benefits.

Japan's love affair with the genre began with brothers Yasushi and Hisashi Ozaki, who formed the country's first bluegrass duo in 1957. Today, young bands like Bluegrass Police are reviving the scene.

The Trump administration aims to turn up the heat on the Taliban and force those fighters into peace talks proposed by Afghan President Ashraf Ghani. Positive assessments by U.S. commanders there during a visit by Defense Secretary Jim Mattis are a stark contrast to darker appraisals from the U.S. intelligence community and a top Afghanistan scholar.

The Iowa State Fair can be a lot of fun, but for presidential candidates it's serious business. California Sen. Kamala Harris came to the fair intent on proving she's a top-tier contender.