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There have been some improvements, but there are still tens of thousands of bridges nationwide that need to be fixed or replaced. Federal funding for such needs has remained flat.

The Department of Homeland Security, an agency repeatedly criticized for internal mismanagement and bloat, is the cornerstone of the new White House initiative to fight cybercrime.

Two species of fern that diverged 60 million years ago are as evolutionarily distant as, say, elephants and manatees. Nonetheless, the two species recently produced a hybrid, say astounded botanists.

As grocery prices continue to rise, many college students are turning to their campus food pantry to help make ends meet.

"There's nobody like The B-52s," Pierson says. "But doing stuff on my own, I can also express more personal songs."

The Shanghai exchange is on a tear, but there could be trouble ahead for ill-informed investors. Analysts say the current upswing is driven by perceptions rather than fundamentals.

President Nicolas Maduro's government hasn't solved food shortages or ended high inflation. It's been more effective in cracking down on the opposition, filing legal charges against many mayors.

Researchers say they can replace DNA in human eggs with genetic material from another woman to prevent devastating disorders in children. But big questions remain on safety and ethics.

The estate tax is yet another piece of the fiscal cliff that needs to be worked out. Those who want to the raise what they call the "Paris Hilton tax" say it applies only to the very rich, who can afford to pay. Opponents of the increase, however, brand it the "death tax" and say it hurts farmers and small-business owners.

On his second album, Unorthodox Jukebox, Mars traverses the pop landscape, pulling in far-flung influences and making them his own.