A vaccine against human papillomavirus — the most common sexually transmitted infection and the cause of almost all cervical cancer — is dramatically reducing the prevalence of HPV in teenage girls.

The first vaccine against HPV, Merck's Gardasil, was approved by the Food and Drug Administration in 2006. Cerverix, from GlaxoSmithKline, was approved in 2009.

The National Hurricane Center has issued coastal warnings in the Gulf of Mexico regarding Tropical Storm Barry. The second named storm of the 2013 hurricane season, Barry is currently in the southwest corner of the gulf; it is expected to make landfall in Mexico Thursday morning.

The center says an Air Force reconnaissance aircraft determined Wednesday that the storm, formerly called Tropical Depression Two, had strengthened. Barry is currently about 75 miles east-northeast of Veracruz, Mexico.

I visited Toy Fair in New York City hunting for ideas for our summer series about kids' culture. One of the big takeaways was the increasing popularity of construction games such as Legos. Sales shot up nearly 20 percent last year. Now, it seems, every major toy manufacturer is scrambling to add new games geared toward kids building things.

It won't be quite like Bruce Willis in Armageddon, but maybe you'll feel just as much a hero.

The White House and NASA are seeking the public's help in hunting for asteroids that could someday smash into Earth. They're also looking for a perfect space rock to capture so that astronauts could go there and study it.

The Federal Reserve will continue its program of purchasing $85 billion in securities and will leave the target interest rate for federal funds untouched to support the U.S. economy, the U.S. central bank said in a policy update issued Wednesday afternoon.

Here's a summary of the state of the U.S. economy from the Fed, which concluded two days of meetings today:

The United Nations Refugee Commission says more than 45.2 million people were in "situations of displacement" around the world as of last year — the most since 1994.

A report from the Office of the United Nations High Commissioner for Refugees says there were 15.4 million refugees in other countries, 937,000 people seeking political asylum and 28.8 million people forced out of their homes but still inside their own countries.

Some fine outdoor cooking this week.