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Bananas are the most popular fruit in America, and demand is growing worldwide, too. But growing bananas requires a lot of pesticides. And a new study shows that some of those chemicals are ending up in caimans living downstream from banana plantations in Costa Rica, where many of the bananas that Americans eat are grown.

Urban farmers are eyeing rooftops that are already green as potential sites to grow food. But there are big obstacles to rooftop farming — from permitting to transporting water and soil to the top of a building.

Not only are Brazilian artists now getting big play in major museums around the world, but something new is happening inside Brazil: There's a burgeoning appetite for art.

It's rivalry week in college football. And this weekend, there's some extra spice as games from Alabama to Florida to Michigan could have an impact on which two teams end up playing for the national championship.

Federal prosecutors recently indicted 25 people associated with the Baltimore City Detention Center on charges of racketeering, and drug and money laundering. Prosecutors allege that prison guards allowed gang members free reign over the prison, helping them smuggle drugs and cellphones into the facility. Weekend Edition Saturday host Scott Simon speaks with Baltimore Sun reporter Ian Duncan about the case.

After determining that the Syrian government has crossed a red line by using chemical weapons, the White House has agreed to start sending military aid to the rebels. Some analysts think it may be too late to tip the balance in Syria, where Assad's forces backed by Hezbollah, Iran and Russia have been gaining ground.

Disgusted by reports that members of the Australian Army emailed videos and pictures that degrade women, the service's leader says its time to change. "If you're not up to it, find something else to do with your life," Lt. Gen. David Morrison says.

President Obama leaves Wednesday morning for a week-long tour through three African countries. It's his first extended visit to the continent as president. He'll be making stops in Senegal, South Africa and Tanzania.

Television networks are up in arms. The new company Aereo is charging a monthly fee to provide a high-definition feed of the basic over-the-air channels, and the stations aren't seeing a penny of it. But CEO Chet Kanojia thinks he's figured out a legal loophole.

Architects have come up with spectacular concepts for vertical farms that would grow crops in city skyscrapers. But many horticulturists think the future of vertical farming isn't in skyscrapers, but rather in large, indoor warehouses lit up magenta by superefficient LEDs.