Judy Woodruff:

This summer will mark the 50th anniversary of Neil Armstrong's first setting foot on the moon, a moment for the ages.

But ever since the space shuttles were retired, there's been a renewed debate over what NASA's mission should be. As it turns out, what's old is new again. There's a big push to return to the moon.

Miles O'Brien looks at those questions and the man who tasked — is tasked with overseeing it for our weekly segment about the Leading Edge of science, technology and health.