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For all the international furor over genetically modified food, or GMOs, the biotech industry has really only managed to put a few foreign genes into food crops.

The first of these genes — actually, a small family of similar genes — came from a kind of bacteria called Bacillus thuringiensis, or Bt. Those genes make plants poisonous to certain insect pests.

Chinese officials are under fire after a local government tried to repair a section of the Great Wall by apparently just paving it over. Now, a centuries-old stretch of the wall looks more like a gray sidewalk than a global treasure.

"The five-mile stretch of wall in northeast Liaoning province is known as a particularly scenic part of the 'wild wall,' " NPR's Anthony Kuhn reports from Beijing. "Its towers and parapets are partially crumbled by seven centuries of wind and rain."

Take a look at this video:

If a word is spelled correctly, the pigeon has been taught to peck at the word. If it's spelled incorrectly, the pigeon is supposed to peck at the star. When it gets it right, the machine hands it some food.

A group of researchers from New Zealand were able to train four pigeons to consistently — with 70 percent accuracy — recognize dozens of words. The smartest pigeon learned about 60 words that it could distinguish from about 1,000 nonwords.

In an interview with The Associated Press, Syrian President Bashar Assad blamed the U.S. for the collapse of a fragile cease-fire earlier this week and denied carrying out well-documented human rights abuses, such as besieging civilians or using chemical weapons against them.

Providing details on a large hacking case, Yahoo says it believes "information associated with at least 500 million user accounts was stolen." The company says its investigation suggests the stolen data doesn't include payment and bank account information, which it says are stored in a different system.

Yahoo suspects that a "state-sponsored actor" performed the hack, stealing users' account information from the company network late in 2014.

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