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    Science and technology

    •January 1, 1970
    • FILE - In this March 9, 2018, file photo, Nema Brewer, an employee of the Fayette County School District, uses a protest sign as a makeshift bullhorn to shout at the Kentucky Senate chambers in protest of Kentucky Senate Bill 1, in Frankfort, Ky. The public education uprisings that began in West Virginia and spread to Arizona, Oklahoma and Kentucky share similar origin stories. Teachers, long tired of low wages and a dearth of state funding, begin talking to each other online. Their Facebook groups draw tens of thousands of members. They share stories of their frustrations and then they demand change. (AP Photo/Timothy D. Easley, File)
    • Teacher Jennifer Galluzzo casts her ballot outside Paseo Verde Elementary Wednesday, April 18, 2018 in Peoria, Ariz. Arizona teachers are weighing whether to walk out of their classrooms to demand more school funding after weeks of growing protests, a vote that's raising questions about how an unprecedented strike could play out across the state's education system. (AP Photo/Matt York)
    • Kawasaki Heavy Industries' collaborative robot stacks rice balls at Delicious Cook &Co's food factory in Narashino, Japan, April 17, 2018.  REUTERS/Toru Hanai
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    FILE - In this March 9, 2018, file photo, Nema Brewer, an employee of the Fayette County School District, uses a protest sign as a makeshift bullhorn to shout at the Kentucky Senate chambers in protest of Kentucky Senate Bill 1, in Frankfort, Ky. The public education uprisings that began in West Virginia and spread to Arizona, Oklahoma and Kentucky share similar origin stories. Teachers, long tired of low wages and a dearth of state funding, begin talking to each other online. Their Facebook groups draw tens of thousands of members. They share stories of their frustrations and then they demand change. (AP Photo/Timothy D. Easley, File)

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