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By analyzing layers in these teeth, scientists have pinpointed a critical window when baby brains are most vulnerable to toxic metals — and linked that to behavior problems later in life.

This summer, at a gathering at the University of Michigan,assembled a Top Ten list of unsolved physics problems. NPR's DavidKestenbaum, with the help of two physicists, lays out these questions.

Mark Everson, commissioner of the Internal Revenue Service, discusses the popularity of electronic filing. He also provides tips on who among us is most likely to be audited and offers options for people who still haven't filed.

The Czech Republic had the biggest win of the World Cup, routing the United States 3-0 Monday. Earlier, Australia staged a late comeback, scoring three goals from the 84th minute until the final whistle to beat Japan, 3-1. Italy beat Ghana 2-0 in the late game.

The Black Eyed Peas co-founder turned entrepreneur is now teaching a class on "agentic AI" for Arizona State.

The former chief of staff of Rep. Bob Ney (R-OH) reaches a plea agreement with federal prosecutors in which he will assist the investigation of his former boss for allegedly doling out political favors to former lobbyist Jack Abramoff. Neil Volz pleaded guilty to conspiracy to commit fraud in the deal.

The Kentucky Derby is celebrated by locals in Louisville — including its smallest residents, who get their own downtown parade.

Crude oil prices hit record highs of more than $70 a barrel. At the end of trading Tuesday, the price settled at $71.60 -- a 95-cent increase over Monday's record close. President Bush, saying he is concerned about higher gas prices, promised the government would stop any price gouging.

For the first time in history, all 10 acts on the "Billboard Top 10" are black. Nine of the 10 are rap acts, and the top spot is held by Pop/R&B songstress Beyonce and Dancehall Reggae star Sean Paul.

Basel Zaraa was a Palestinian refugee. When his 5-year-old daughter started asking him questions, he told her this story.