Democrats lost no time in attacking the budget plan House Republicans introduced Tuesday. The plan saves money by overhauling Medicare, but Democrats argue it will destroy the program.

One of the Democrats leading the charge is Vice President Joe Biden. Taking on the role of candidate, Biden was in Coconut Creek, Fla., giving the second in what he promises will be a series of campaign speeches challenging the Republicans.

Students walked out of more than 30 Miami schools on Friday, some chanting "Justice for Trayvon," in a sign of solidarity with the 17-year-old black student who was killed by a neighborhood watch volunteer last month in Sanford, Fla.

Protesters numbered more than 1,000 at some schools, others fewer than 100. Some teachers and principals gave their tacit approval.

The first walkout was at Carol City High School, where Trayvon Martin was a student last year. Hundreds of his old schoolmates walked out in the middle of the school day.

Fresh Air Weekend highlights some of the best interviews and reviews from past weeks, and new program elements specially paced for weekends. Our weekend show emphasizes interviews with writers, filmmakers, actors, and musicians, and often includes excerpts from live in-studio concerts. This week:

A discarded chunk of a Russian rocket forced six space station astronauts to seek shelter in escape capsules early Saturday, then ultimately safely passed in front of the space station, according to NASA.

NASA spokesman Rob Navias told The Associated Press ahead of the incident that the space junk would barely be close enough to be a threat. But if it had hit the station, it could have been dangerous, so the astronauts — two Americans, three Russians and a Dutchman — woke early and climbed into two Soyuz vehicles ready to rocket back to Earth just in case.

Former New Jersey Gov. Jon S. Corzine directly ordered that $200 million from a segregated customer account be transfered to cover a $175 million overdraft in a London account. That's according to a memo (pdf) from the House Committee on Financial Services, which is scheduled to hold a hearing next week about the spectacular collapse of MF Global.