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NPR's Mary Louise Kelly talks with Washington Post aging columnist Anne Lamott about what it means to get older in the United States.

A review of clinical trials using vitamin D to build bone density in middle-aged women finds that it doesn't help. That may be because those women aren't generally low on calcium and that D helps the body absorb calcium in the gut only if it's seriously lacking. It may do more good in the elderly.

Astrophysicist Adam Frank says that private rocket ships will launch a sure future for Americans.

Host Jacki Lyden talks to comedian Robert Klein, the narrator of the documentary When Comedy Went to School, which opened this week in New York City.

Also this week: a look at President Obama's decision to keep more U.S. troops in Afghanistan.

Mammograms should start at age 40, according to the U.S. Preventive Services Taskforce. And a new study finds hormone therapy for menopause symptoms is safe.

As the final ballots continue to be counted in Arizona, Democrat Kris Mayes leads her Republican opponent Abe Hamadeh by a razor-thin margin for state attorney general.

Since the end of the Cold War, many Americans have largely dismissed the threat of nuclear war. But Paul Bracken warns that Americans feel a misguided sense of calm. In The Second Nuclear Age, he argues that the second age of nuclear politics has arrived and the U.S. must face a new nuclear reality.

The ongoing violence and tumult in Syria's largest city belie a richer, more prosperous past. One small object — a finely woven hat — offers evidence of life in a thriving cultural hub.

We have a remembrance of astronaut Jim Lovell, who died on Thursday at the age of 97. Lovell never landed on the moon, but he gave us one of the most iconic moments in American astronomy.