Education

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In this April 10, 2014, photo, student teacher Franchesca Moreno, 21, reads to Andreanna Thomas, 6, right, and Alana Cawthon, upper left, at Bennett Park Montessori School in Buffalo, N.Y. Moreno is among the first future New York teachers required to pass a kind of "bar exam" to become professionally certified. (AP Photo)

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Dave Bloomsness, left, and Robert Black talk in North Medford High School’s observatory in Medford, Ore, date not known. Bloomsness and Black are among the 24 educators who were selected to fly aboard NASA’s Stratospheric Observatory for Infrared Astronomy next week. (AP Photo/The Mail Tribune, Julia Moore)

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ADVANCED FOR RELEASE SATURDAY, MAY 3, 2014 Robinson Elementary School kindergarten teacher Le Tran works with students Dereon Adams-Clayton and Kamiyah Brown, March 4, 2014. Tran escaped the Fall of Saigon, was later adopted by teachers and is now a teacher herself. (AP Photo/Beloit Daily News, Hillary Gavan)

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Friends of Maren Sanchez, including boyfriend Jarrod Butts embrace during a vigil for her at Jonathan Law High School, Monday, April 28, 2014, in Milford, Conn. Sanchez was fatally stabbed inside the school on Friday hours before her junior prom. (AP Photo/Jessica Hill)

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People raise candles as they listen to Maren Sanchez sing during a vigil for her at Jonathan Law High School, Monday, April 28, 2014, in Milford, Conn. Sanchez was fatally stabbed inside the school on Friday hours before her junior prom. (AP Photo/Jessica Hill)

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People release balloons as they attend during a vigil for Maren Sanchez on the football field at Jonathan Law High School, Monday, April 28, 2014, in Milford, Conn. Sanchez was fatally stabbed inside the school on Friday hours before her junior prom. (AP Photo/Jessica Hill)

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A woman carries balloons during a vigil for Maren Sanchez at Jonathan Law High School, Monday, April 28, 2014, in Milford, Conn. Sanchez was fatally stabbed inside the school on Friday hours before her junior prom. (AP Photo/Jessica Hill)

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A woman and child hold hands as they sit on the bleachers during a vigil for Maren Sanchez at Jonathan Law High School, Monday, April 28, 2014, in Milford, Conn. Sanchez was fatally stabbed inside the school on Friday hours before her junior prom. (AP Photo/Jessica Hill)

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A woman cries during a vigil for Maren Sanchez at Jonathan Law High School, Monday, April 28, 2014, in Milford, Conn. Sanchez was fatally stabbed inside the school on Friday hours before her junior prom. (AP Photo/Jessica Hill)