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A new Mexican law means less scheduling snafus this spring for people who cross the border between Tijuana and San Diego. The new law synchronizes daylight savings schedules in U.S. and Mexican border cities in 2010.

The failed Dec. 25 airline bombing has spotlighted the fact that the Transportation Security Administration has been without a permanent leader for a year. A GOP senator put a hold on President Obama's nominee because the administration won't rule out collective bargaining for airport screeners.

The failed Christmas Day attack on a U.S. airliner has triggered a new wave of scrutiny of the U.S. government's approach to aviation security. There are questions about whether the U.S. government is being aggressive enough in implementing other kinds of measures to detect suspicious passengers.

The Christmas Day attempt to blow up a U.S. airplane has exposed critical weaknesses in airport security measures. Critics have focused on technological and intelligence gaps, but some also question whether authorities are focused enough on other measures to identify suspicious people.

The Transportation Security Administration has been testing new equipment that it says could detect objects like the one used in the Christmas Day attack on a jetliner bound for Detroit. But those efforts have met strong opposition from privacy groups, which have had the backing of Congress. The screening has been described as a virtual strip search, but proponents think the latest incident will pave the way for its deployment.

The attempted bombing of a Northwest Airlines flight on Christmas Day has thrown a spotlight on the nation of Yemen, after an al-Qaida group that's based there claimed responsibility for the foiled attack. But the United States had already been ramping up its operations in Yemen to counter the al-Qaida threat there.

In the wake of the unsuccessful Christmas Day terrorist attack on a Northwest flight bound for Detroit, many Americans seemed to react with a collective shrug and some humor. Experts say the reaction is perfectly appropriate to the risk level shown so far.

In the wake of the unsuccessful Christmas Day terrorist attack on Northwest Flight 253 bound for Detroit, many Americans — with the exception of political partisans — seemed to react with a collective shrug and some humor.

It's been more than 10 years since scientists first showed it is possible to grow embryonic stem cells. Despite political wrangling over the years, scientists have made advances in basic research. Still, there is a ways to go before stem cells can be used to treat disease.

Some say they hold the potential for medical miracles. Others claim they are a moral abomination. Either way, human embryonic stem cells captured headlines during the past decade in a way few areas of scientific research have before.