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Airs Sunday, March 13, 2011 at 8 p.m. on KPBS TV

President Obama's Midwest bus trip is part listening tour to show that he's concerned about the problems of actual Americans, part rolling photo op that gives him a chance to make the case for compromise (and to blame congressional Republicans for not doing enough on that score.)But it also was a chance to try and score a few points on the would-be Republican nominees.

Recent unrest in Mali and Algeria point to the growing influence of al-Qaida in North Africa. Wall Street Journal Pentagon reporter Julian Barnes and Ret. Col. Thomas Dempsey, chair for security studies at the Africa Center for Strategic Studies, explain the latest developments and the threat al-Qaida presents in the region.

For months, prices paid to farmers for corn, wheat and soybeans have been shooting up. But so far, grocery prices have held steady for consumers. When will you have to pay the price?

HBO has a reputation for original, true-to-life series, but on Sunday it will premiere a show that is more epic fantasy than anything else the network has been doing. It's called Game of Thrones and it's been likened to The Sopranos, if it were set in Middle Earth.

The uprisings in Tunisia and Egypt came just as world food prices hit a record high. The World Bank reported this week that the cost of food is now at "dangerous" levels, a fact that is far more burdensome for people in the developing world.

Independent researchers said Friday that restrictions on water deliveries to California's farm belt meant to protect threatened fish can be scientifically justified.

Oak Borer Could Wipe Out Trees From San Diego To Oregon

Workers once tore up a Phoenix parking lot and found nearly 200 ancient human burial sites under it, evidence of civilizations in centuries past. Commentator Craig Childs explores those worlds by trying to map the ancient world beneath the modern one.

A San Diego County water agency is in favor of a proposal to fix the states water supply problems. KPBS reporter Ed Joyce has more.