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:

Two astronauts aboard the International Space Station began their fourth and final space walk early Saturday to finish a series of repairs aimed at extending the functioning of a cosmic ray detector attached to the spacecraft.

The planned six-and-a-half-hour foray outside the space capsule began shortly after 7:00 a.m. ET and was being shown in a live video feed from NASA.

When Aysha Renna decided last month to demonstrate against India's new citizenship law on her college campus in New Delhi, it never occurred to her that doing so might be dangerous.

The Haden sisters — Petra, Rachel and Tanya — have a long history in American music.

Updated at 12:06 p.m. ET

President Trump "did absolutely nothing wrong," White House counsel Pat Cipollone said Saturday, as lawyers representing the president got their first shot to poke holes in the impeachment case made this week by Democrats.

Saturday's proceedings, which lasted a little more than two hours, set up the White House arguments in the impeachment trial. The proceedings resume Monday at 1 p.m.

The president's team told senators that the House managers selectively withheld evidence in their arguments against the president.

Many reports refer to the newly identified coronavirus in Wuhan, China, as a "mystery" virus. Is it really a mystery? Do masks help keep you from getting infected? If an animal carries the virus, will cooking it make it safe to consume?

These are some of the questions circulating about the virus called 2019-nCoV. Here are some answers.

Hank Bolden is an 83-year-old undergraduate at the Hartt School of Music in Connecticut. He is also an atomic vet — one of thousands of soldiers exposed to secret nuclear weapons tests during the Cold War.

Bolden is one of only a few African-Americans still here to tell the story.

In 1955, Bolden was in his late teens and stationed in California. One day he was told he'd been chosen to participate in a special military exercise. "I had no idea what I was selected for," he said.

As the owner of a yellow lab named Gus, author Maria Goodavage has had many occasions to bathe her pooch when he rolls around in smelly muck at the park.

Nevertheless, her appreciation for his keen sense of smell has inspired her write best-selling books about dogs with special assignments in the military and the U.S. Secret Service.