Daniel Tarullo, the Federal Reserve?s point man on overhauling the financial system, has emerged as the most powerful figure wrestling with the nation?s biggest banks to make them take fewer risks that could endanger the economy.

Four high-ranking federal lab workers found a way to turn ?per diem? funds for a temporary assignment into a steady flow of extra income ? at taxpayers? expense. The overpayments, discovered in an inspector general?s audit, boosted the annual pay of some of the employees by as much as $64,000.

The House approved a bill Friday that would provide $642.5 billion in defense spending for the next fiscal year, despite a veto threat from the White House, which objected to a series of provisions that would limit the president?s authority and challenge administration policies.

? Ezra is guest-hosting for Rachel Maddow again Friday night. Tune in!

?By 2025, one-third of U.S. cities will have more seniors than children.

?Tokyo?s private rail lines turn a profit largely by owning a lot of real estate and stores.

Kathleen Sebelius, the secretary of Health and Human Services, delivered the commencement address at Georgetown University?s Public Policy Institute on Friday. Leaders in the Catholic Church had pressured Georgetown to rescind her invitation, given her key role in implementing the health reform law, which requires employers to cover contraceptives.

Thinking of packing up and moving to another state this year? If so, you?re an outlier. Americans on the whole are becoming increasingly less mobile. In the early 1990s, 3 percent of Americans moved across state lines each year. Today, the rate is half that.

Unemployment levels in April fell in the District, increased slightly in Maryland and remained steady in Virginia, according to a U.S. Bureau of Labor Statistics report released Friday.

The spring tourist season brought Virginia several thousand jobs in the leisure and hospitality sectors. Both Virginia and Maryland lost jobs in professional and business services, which may be connected to a slowdown in government contracting amid uncertainty over federal spending cuts.

With Facebook now on the market with a $104 billion valuation, how will the brainchild of co-founder Mark Zuckerberg move ahead as a public company?

At 28, Zuckerberg has seen the project he began building with other students in a college dorm room become the subject of an Oscar-nominated film, the focus of frenzied investors and a central part of the daily lives of nearly 1 billion users ? 901 million, at last count.

ATHENS ? Homeward bound after the Trojan War, Odysseus of Greek myth had to pick a path through seas harboring a monster with six heads and a whirlpool that digested ships whole. Now, whether modern Greece exits the euro ? potentially triggering global economic turmoil in the process ? depends on the tough choices of Ivi Moreti and her 11 million countrymen.

ATHENS ? Europe?s economic woes escalated Friday as fears mounted over troubled Spanish banks and the credit rating agency Fitch further downgraded Greece?s debt, citing heightened worries that the country might be forced to abandon the euro.