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Guest host Jacki Lyden and Editor Ammad Omar take a look at listener feedback and updates on stories covered on the program. One listener said he was angered by a conversation on rhododendrons, so they go to two of the nation's top experts for answers. Also, African leaders turn up the pressure on military officers who have staged a coup in Mali.

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.

Two top administrators at Penn State University were in court Monday. They're facing charges in connection with an investigation into alleged sexual abuse by former assistant football coach Jerry Sandusky.

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 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.

Host Robert Siegel speaks with Cassee Cain and Ziyuan Liu, who recently won the team portion of the Siemens Competition in Math, Science and Technology. The high-schoolers from Oak Ridge, Tenn., modified the Kinect device for Microsoft's Xbox 360 in order to analyze human gait. Cain and Liu hope to use the device to diagnose and treat medical problems that affect movement.

Some two dozen Americans have given $1 million or more to superPACs in the 2012 presidential campaign. The vast majority of them have been Republicans, but Jeffrey Katzenberg, the head of DreamWorks Animation, has chipped in $2 million to help out the superPAC supporting President Obama.

The wife of disgraced Chinese leader Bo Xilai has gotten a suspended death sentence for killing a British businessman. Gu Kailai was convicted after confessing to killing Neil Heywood. Her accomplice, a family employee, was sentenced to nine years in prison.

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.

With a win Friday night against Indiana, the University of Kentucky Wildcats moved into the elite 8 of the NCAA basketball tournament. Kentucky has plenty of talent assembled, overseen by coach John Calipari.