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Reporting in the journal Biology Letters, Jeremy Goldbogen and colleagues say blue whales perform underwater acrobatics when they're eating: they rotate 360 degrees while they gulp krill. Reaching 90 feet in length, blue whales are the largest animals on the planet. Goldbogen is studying their dining habits to understand what fuels their growth.

When researchers asked hospitals how much a total hip replacement would cost a 62-year-old woman paying cash, a surprising number couldn't or wouldn't say. Health care could learn something from the car industry about working with consumers, critics say.

GOP presidential candidate Mitt Romney's choice of Rep. Paul Ryan as his running mate seems to be uniting both Republicans and Democrats. Here's a quick look at the pluses and minuses of the decision, from the point of view of the man at the top of the ticket.

The U.S. Air Force's top officer, Gen. Norton Schwartz, is retiring after four years on the job. Schwartz was a champion of remotely piloted aircraft, or drones. But he says the Air Force will continue to need pilots for decades and more manned aircraft to ensure it can prevail with a minimum use of force.

Rick Snyder once again breaks ranks with other top Republicans by vetoing bills that opponents said were meant to suppress voter turnout.

The Obama administration is expected to ask for $50 billion to $60 billion. Top administrators told Congress Wednesday that they want at least some of that money to go toward preventing the kind of devastation caused by Sandy and other recent storms.

The U.S.-China economic relationship is under pressure again with allegations from the House Intelligence Committee that two top Chinese telecom firms are security threats. China responded by saying the report could damage relations with the U.S.

Tens of millions of dollars are pouring into Virginia in hopes of swaying the governor's election there. If Democrat Terry McAuliffe wins, it could be a strong indicator that the once red, now purple state is shifting into the blue column.

In Portland, Ore., doctors and patients get to the Oregon Health and Science University not by a twisty, two-lane road up Marquam Hill, but by a gleaming silver gondola. The aerial tram has cut the commute from up to 45 minutes to a three-minute ride in the sky.

Cyclist Graeme Obree, 48, has set a new world speed record for prone bicycles, as the man known as the Flying Scotsman topped 56 mph during a session at the just-completed World Human Speed Championships, held at Battle Mountain in the Nevada.