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Also: Mass casualties after shootings in Toronto and Tuscaloosa; North Korea names new army vice marshal; Fed's Bernanke to testify about economy; court martial set to begin in Texas air base scandal.

Also: February jobs report is due this morning; Japan looks ahead one year after disaster; opposition leader in Syria rejects talks with Assad regime; "Kony 2012" buzz continues.

Also: The Curiosity rover zaps Mars rock with a laser; Pakistan's president orders investigation into blasphemy case against girl with Down's Syndrome; Myanmar's government eases some press restrictions.

The National Academy of Sciences has toughened up its guidelines to call cutting corners, dubious statistics and not fully sharing research methods "detrimental" to science.

It's one of the cancers highlighted in a new report that looks at the growing number of cases worldwide.

City leaders in Youngstown, Ohio, are hoping that by leasing land to drilling companies, they might generate funds to demolish vacant homes and buildings. Some refer to this as "frackmolishing," and opponents worry the drilling will cause environmental damage.

In India, hundreds of millions are casting their ballots in parliamentary elections over the next month. NPR's Rachel Martin talks to Indian reporter Supriya Sharma.

Florida Gov. Ron DeSantis lashed out about the firing of data scientist Rebekah Jones. DeSantis attacked Jones' claims that she created the state's highly praised COVID-19 dashboard portal.

The governor, lieutenant governor and attorney general of Virginia continue to resist calls to resign after two of them admitted to appearing in blackface, and one faces accusations of sexual assault.

Six-player Texas Hold 'em has been too tough for a machine to master — until now. A bot named Pluribus crushed some of the world's best poker players using brash and unorthodox strategies.