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Hillary Clinton and Donald Trump dominated in the South, according to Associated Press results. Bernie Sanders and Ted Cruz won their home states, and Marco Rubio gained his first victory of 2016.

The pesticide got "conditional" approval eight years ago, but the EPA now says it could poison aquatic life. The move is raising hope among activists who want tighter regulation of pesticides.

FBI Director James Comey and Apple's top lawyer testified before the House Judiciary Committee Tuesday over the court order forcing Apple to unlock an iPhone owned by a terrorist.

On the Republican side, Donald Trump is projected to win in Georgia. For the Democrats, Hillary Clinton takes Georgia and Virginia, while Bernie Sanders won in his home state of Vermont.

NPR's Ari Shapiro interviews Rep. Joaquin Castro of Texas about how things are looking for Hillary Clinton on Super Tuesday. She is projected to win the Democratic primaries in Virginia and Georgia.

Even low levels of lead in children can cause learning or behavioral problems, the CDC says. But foods packed with calcium, iron and vitamin C can help reduce the absorption of lead in kids.

The high court "went dark" on Tuesday when the lights briefly flickered out during arguments. Justice is blind though, and the case at hand continued through about five minutes of darkness.

In a city where blacks make up 9 percent of the population, nearly a third of those shot by police over a five-year period were black suspects.

Hawaii Rep. Tulsi Gabbard, who endorsed Bernie Sanders, and Georgetown University's Mo Elleithee say though Hillary Clinton is leading the race, Sanders has brought focus and new voices to the party.

Sen. Barbara Boxer, D-Calif., talks with David Greene about Hillary Clinton's Super Tuesday results and what they mean for the country moving forward.