Shimek Elementary and U of Iowa students watch as a weather balloon is released at the School of The Wild’s Bluestem Shelter at Macbride Nature Recreation Area on Friday, April 25, 2014. 13 elementary education methods students worked with UI graduate Kami Skay’s Shimek Elementary fifth graders earlier this week to design and build helium weather balloons that carried cameras high into the sky to measure the curvature of the earth.(Justin Torner/Freelance for the Gazette)