It started as trash talk between two contributors to a national security blog. They decided to host a drone smackdown to see if one guy's machine could take down another.

Unarmed drones, of course. The kind you can put together with a toy-store model and $200 in modifications. But the game turned out to have some serious undertones.

First, a word about the location. For a moment last week, the whole drone smackdown was up in the air.

Tell people you're doing a story about the life spans of Korean eunuchs, the typical reaction is a giggle or a cringe.

But if you can overcome your visceral response to the topic, a study scientists in Korea did is quite interesting, both for what they found, and the way they found it.

Several scientists have shown that there is a link between longevity and reproduction: the greater the fertility, the shorter the life span. This has been fairly well established in nonhuman animal species, but proving it's the case for humans has been tricky.

NPR's Neal Conan reads from listener comments on previous Talk of the Nation show topics, including underappreciated jobs, what it's like for Americans to live abroad when the U.S. is the target of civil unrest, where we find atonement, and how to pitch a knuckleball.

Transcript

NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. Last week, NATO announced sharp reductions in some joint operations in training with the Afghan army and police. The announcement followed a series of so-called green on blue attacks, where Afghan soldiers and police killed U.S. and NATO troops.

In Britain, frustration over why fiery radical Muslim preacher Abu Hamza al-Masri remained a free man for so many years went all the way to the top of society to the queen, the BBC revealed — a revelation the network has subsequently apologized for.

Transcript

NEAL CONAN, HOST:

Earlier today, both of the major party candidates for president spoke on foreign policy in New York. Former Governor Mitt Romney at the Clinton Global Initiative and President Barack Obama before the General Assembly of the United Nations. We're going to play back substantial excerpts from both. Governor Romney spoke first after an introduction by the former president who delivered a well-received speech on behalf of his opponent at the Democratic National Convention.

(SOUNDBITE OF SPEECH)

Transcript

NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. Anyone with brothers or sisters knows about the teasing, the fights and the betrayals that can come along with solidarity and the love. But all of that changes when one sibling has an intellectual disability like Down's syndrome or autism.

A lot of emphasis is often placed on the child with special needs while their brothers and sisters can feel left out, guilty, resentful, responsible and embarrassed. Of course, the sibling's relationship can last a lifetime.

As the lockout of NFL officials over a labor dispute continues, the replacement refs have been roundly criticized for an increase in bad calls and a general loss of control on the field. NPR's Mike Pesca explains the issues with replacement refs and the ongoing dispute with the regular officials.