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New York Times columnist Gail Collins has already cited the dog in just shy of three dozen columns. She says such moments can reveal character — in this case, Romney's rigid emphasis on efficiency.

Big changes in 2011 — from the Arab Spring to the death of North Korea's dictator — create opportunities for 2012. But change can be scary, even when the regimes to be replaced are unpopular or repressive, because there's never a guarantee the new regime will be better.

The former CEO of Godfather's Pizza has risen to the top of the pack in the GOP presidential race. Herman Cain says the substance of his ideas — including his 9-9-9 tax plan — is propelling his surge. But analysts say he doesn't have the field organization that a winning candidate typically has.

The embryos would not be used for reproduction, but rather for the creation of embryonic stem cells. Many scientists believe that human embryonic stem cells made this way could revolutionize medicine.

New jobs numbers came out Friday, reporting employers added more than 100,000 workers to their payrolls. That's better than many forecasters were expecting, but not good enough for the 14 million Americans who are still out of work. NPR's Scott Horsley reports on what the numbers tell us about the economy and what they mean for President Obama.

GOP candidate Mitt Romney says his effective tax rate is 15 percent. Why so low? The answer lies in a theory that if you tax investment too high, economic growth and job creation are discouraged. But it's somewhat controversial, not least because most of the people who get to pay that lower rate are well-off.

The killing of an Iranian nuclear scientist this week marked the fifth time in two years that assassins have targeted scientists in Tehran. Weekends on All Things Considered takes a look at what this new level of diplomatic strain means for the Middle East and the U.S. economy.

Two former News Corp. editors, Andy Coulson and Rebekah Brooks, have been charged with crimes involving a phone hacking scandal. Coulson is also a former aide to the Prime Minister. There had previously been charges with interfering with the police investigation, but the new charges are directly involved with interfering with the phone messages at the heart of the scandal.

Mitt Romney flies to Israel this weekend on the second leg of his overseas tour. He'll meet with top Israeli officials as well as the Palestinian prime minister. The Republican presidential candidate is using the trip to court the Jewish vote, which went overwhelmingly for Barack Obama in 2008.

The Justice Department and the intelligence community say reauthorizing the Foreign Intelligence Surveillance Amendments Act, which expires at the end of the year, is their top national security priority. But an interesting mix of senators are sounding alarms about whether the government is secretly gathering too much information on innocent Americans, and keeping it for far too long. They cite a newly declassified letter that exposes an incident where even the Obama administration acknowledges it went too far.