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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.

Trudeau's Liberal Party defeated the Conservatives but still fell short of an outright majority. The Liberals will need to reach out to smaller rival parties to form a new government.

This week's first primary debate will be an introduction to the country for 20 Democratic presidential candidates. There's a clear top tier to the race, but it could all shake up when voters tune in.

The middle-school top prize for NPR's second annual Student Podcast Challenge goes to ... The Dragon Kids.

Oil prices rose and the stock market fell Friday, as investors reacted to rising tension in the Middle East. Fallout from the killing of a top Iranian military leader was more muted than expected.