In this Jan. 20, 2017 photo, teacher Matt Erbach explains to his students what he is looking for as the group of Streamwood High School students in Streamwood, Ill., design a micro generator using wind power to light up areas around homeless shelters. Their wind-powered generator idea won the state competition in the Samsung Solve for Tomorrow contest, which encourages teachers and students to solve real-world issues using classroom skills in science, technology, engineering, arts and mathematics.