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The Red Cross is requesting donations of O positive and 0 negative blood after the shooting of 19 on Saturday. Read more» 1

Anthony Palazzetti, giving blood during a drive at Arizona State University, said his mother’s battle with leukemia taught him the importance of donating. At 19, Palazzetti belongs to the state’s largest blood donor group, according to United Blood Services of Arizona. Donations from the traditionally active 16- to 19-year-old demographic have surged since a 2008 law lowered the minimum legal age for donors from 17 to 16 with parental consent.

Teens have traditionally been active donors, but officials say donations from the age group have surged since a 2008 law lowered the minimum age for donors from 17 to 16 with parental consent. Read more»