Breathing is a function that most of us take for granted. Not Natalie Peterson. Her son, Garrett, was born with a weak, soft cartilage in his windpipe — a rare condition called tracheobronchomalacia — which would cause him to stop breathing at a moments notice. When he got upset, or even sometimes just with a diaper change, he would turn completely blue, Peterson told NPR. But a recent development in 3-D printing has allowed 16-month-old Garrett to breathe again. Scott Hollister, a University of Michigan biomedical engineer, and Dr. …
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