IN TIMES of crisis and imminent danger, a keen presence of mind is key to surviving the ordeal. When Martha Rivera Medina, an elementary teacher in Monterrey, Mexico, sang for her pupils the Spanish version of the famous Barney song about chocolates and treats during a heavy shooting that killed five people just outside the school, she was able to calm her scared pupils and successfully diverted their attention away from the deafening gunfire. She then asked the kids to join her in singing. When a little girl was worried and alarmed, she told her recorded it all on her cellphone video.
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