Kelsey Bohman, 18, wants kids to play with their food! When Kelsey was 11, she was diagnosed with cancer. At the hospital, doctors used a spirometer to measure air flow to her lungs. She had to blow into the device to push a ball up a tube. Now cancer-free, Kelsey has created a toy spirometer that shoots marshmallows. "The launchers have brightened the days of so many kids," she told TFK.