The $250 Biohack That's Revolutionizing Life With Diabetes

Photographer: Mark Sommerfeld for Bloomberg Businessweek When her daughter, Sydney, was diagnosed with Type 1 diabetes at age 8, Kate Farnsworth stopped sleeping through the night. She'd set the alarm for 3 a.m. so she or her husband, Dave, could prick the girl's fingers and check her blood sugar.

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