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Neil Young looks at his career against the backdrop of history. Waging Heavy Peace debuts at No. 3.

Many birds seek out anthills, but not for a snack: They just want to roll around in a pile of insects. Some scientists think this strange behavior serves as a form of insect repellent. Others maintain that "anting" is a fun, pleasurable (and maybe even habit-forming) experience for birds.

On this week's show, we talk about time travel, Joseph Gordon-Levitt's face, and how exactly to go about pushing the culture you love on other people.

An American monk is now leading one of the most important monasteries in Tibetan Buddhism. The Dalai Lama appointed Nicholas Vreeland as the abbot of a southern Indian monastery to help bridge Buddhist tradition with the Western world. Vreeland talks with host Michel Martin about what it means to be an American holding such an important post.

Republican Mitt Romney delivers a needed jolt to his campaign at the first presidential debate. Ron Elving and Ken Rudin dissect the memorable moments and look ahead to next week's matchup between Vice President Joe Biden and Romney's running mate, Rep. Paul Ryan, R-Wis.

Mapping streets is easy. The trick is pinning down businesses and giving accurate turn-by-turn directions, as many people discovered when Apple launched its apology-worthy Maps app for iOS 6. Rakesh Agrawal, principal analyst for reDesign mobile, talks about how mobile maps are made--and what can be done to improve them.

A recent study conducted at the University of Pennsylvania identified key molecules involved in forming long-term memories. Experts discuss how this is the latest in a growing field of research on how our bodies regulate our genes, and how this process affects our memories.

Refinery and pipeline troubles pushed wholesale fuel costs to a record high this week, leading to higher gas prices for Californians. Industry watchers say those prices may not drop any time soon.

Reporting in Science, researchers write that mouse stem cells can be transformed not only into egg cells--but into newborn pups. Sean Morrison, a stem cell expert at the University of Texas Southwestern, explains the stem cell's journey, and what it could mean for fertility and assisted reproduction.

In The Joy of X: A Guided Tour of Math, from One to Infinity, mathematician Steven Strogatz provides an entertaining refresher course in math, starting with the most elementary ideas, such as counting, and finishing with mind-bending theories of infinity--including the idea that some infinities can be bigger than others.