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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.

A declassified CIA report about the U-2 spy plane program lifts some of the veil of secrecy about a part of Nevada that fascinates sci-fi fans. For instance, the men who wanted to turn it into a top-secret site almost died the first time they went there. That's among five things interesting details.

The Muslim Brotherhood and its supporters are back in the streets. The government has said it will use live ammunition to protect public buildings and security forces. After Wednesday's crackdown left more than 600 people dead and nearly 4,000 wounded, the country is is shedding more blood.

Yahoo has redesign some of its major sites — the latest step in CEO Marissa Mayer's dramatic turnaround of the Internet company. Before Mayer interviewed for the job at Yahoo, her career at Google appeared to have stalled. Renee Montagne discusses this with Nicholas Carlson, who wrote a profile of Mayer for the news website Business Insider.

"Anyone who approaches this logically" would conclude that President Bashar Assad's forces used chemical weapons "on a massive scale" last week, White House spokesman Jay Carney said Tuesday. President Obama is weighing "the appropriate response," Carney added.

The Myanmar opposition leader is being criticized for cooperating with the former military rulers who kept her under house arrest for nearly two decades. But supporters say she is trying to show she has what it takes to lead the nation.

Ruth Ann Steinhagen was 19 when she shot Eddie Waitkus, a Philadelphia Phillie. She had been obsessed with him, and lured Waitkus to a Chicago hotel room. Initially judged to be insane, she was never tried. For about 60 years, she lived a quiet life in Chicago.

Young voters overwhelmingly supported Barack Obama in each of the past two presidential elections. Making sure they don't vote Democratic again is a top priority for national Republicans. Some young conservatives offer their ideas about what the GOP needs to do to win over their generation.

The World Cup begins Thursday in Brazil. The U.S. team has its first match against Ghana the following week, the start of the so called "group of death."

It's clear this year that this will not be another 2010 or 2012, when upstarts embarrassed the GOP's conventional favorites in primary after primary.