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Rep. David Rivera, R-Fla., was charged Wednesday by Florida authorities with alleged ethics violations while he was in the state Legislature, perhaps imperiling his bid for re-election to the House in an already tight contest.

This November, three states will vote on ballot initiatives to legalize marijuana for recreational use. The legalization effort is getting support from U.S. attorneys and a Republican candidate for Senate. Some of the most intense opposition is coming from earlier legalization pioneers.

"One common property we see in animal groups from schooling fish to flocking birds to primate groups is that they effectively vote to decide where to go and what to do," says an evolutionary biologist. But like human leaders, successful animal leaders know they can't get too far ahead of their constituents.

We drink a lot of diet soda in this country, so when researchers disavowed a study linking aspartame to rare cancers just before publication, we took notice. The whole issue illustrates what makes scientific studies so confusing to the public. We'll keep you posted on this.

Gupta was once a director at Goldman Sachs and Procter & Gamble. He was convicted of leaking information to convicted hedge fund manager Galleon Rajaratnam.

Voters say they put little to no stock in the editorials, even when they fervently agree with those endorsements. That's reflective of newspapers' status in many markets. But one Republican expert says a newspaper endorsement can be effective at persuading undecided voters.

There are more ways than ever to watch TV programs on the Internet, from Netflix and Amazon to Hulu. But many viewers discover that watching TV on the Web can be frustrating, as their favorite show might suddenly stop and stutter, the victim of a lack of bandwidth.

President Obama barnstormed from Iowa to Las Vegas and L.A. on Wednesday, before taking a red eye back east.

Ron Briggs, a member of the Board of Supervisors in El Dorado County, Calif., and his father helped expand the state's death penalty in 1978. Now Briggs wants the death penalty repealed and replaced with life without parole. Renee Montagne speaks with Briggs about his shift from death penalty supporter to death penalty opponent.

Growing algae as a source of fuel could consume vast amounts of water and fertilizer, according to a study by the National Academy of Sciences. There's also a risk that the energy required to produce these fuels would make them impractical. These daunting technical problems need to be overcome if the nation wants to turn to algae fuels as a substitute for gasoline.