HANKINSON, N.D. — What started as a school marketplace project turned into a practical invention for Hankinson, North Dakota, sixth grader Hudson Grohnke, who created a device called the “Bolus Buddy” to help make handling insulin vials and syringes easier for people with diabetes. The Bolus Buddy is designed to hold a syringe and insulin vial together, helping users safely extract insulin without dropping the vial or accidentally poking themsel…