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Alan Rosenthal, a giant in the study of state legislatures, was also a leading figure in changing the way they operated. He died this month, at 81.

As investigators look for what caused last weekend's train crash in Canada, a question is emerging across the border in the U.S.: Could it happen here? Transportation safety officials have warned railroads for years about the types of tanker cars involved in the Lac-Megantic accident. But they are still widely used in Canada and the U-S.

It was a doughnut domino effect as folks chose to "pay it forward" by paying for the car behind. At a Canadian shop more than 200 customers did the same thing. Is this becoming a trend?

A fossilized tyrannosaur tooth found lodged between bones in a hadrosaur's tail is giving paleobiologists pretty firm clues about the tyrant king's meal plan. And Hollywood may have been right all along — T. Rex definitely knew how to kill.

The recommended change would mean that patients would begin treatment before they get extremely sick. In Africa, where millions of people are infected with HIV, a move to earlier treatment would be challenging for the public health system.

By signing on to liberal Sen. Kirsten Gillibrand's bill to remake the military justice system, conservative Sens. Ted Cruz and Rand Paul have aggravated some in their party.

Democratic Sen. Kirsten Gillibrand is winning more support for her effort to put serious military criminal cases in the hands of prosecutors. Commanders currently decide whether to try a case. On Tuesday, two Republican senators, and possible 2016 presidential hopefuls, added their names: Ted Cruz and Rand Paul.

If you think deep yellow yolks are an indicator of higher nutritional value in eggs, think again, scientists say. Egg yolks come in a rainbow of colors — from pale white to red orange or pink. They may look strange, but they're still good for you.

One year ago Saturday, James Holmes allegedly opened fire on a crowded theater in Aurora, Colo. Within minutes, 12 people were dead and dozens more injured. The Holmes trial is many months away. How have the city and state responded to the killings over the past year?

Fire is a natural part of the western landscape, and a push over the last century to eliminate fires has threatened the habitats that some plants and animals need. In a Montana valley, fire scientists are trying to show that they can actually save wilderness by burning it.