This is the first installment of a five-part series on ransomware in schools. The Tucson Unified School District and Nantucket Public Schools seem to have little in common. Tucson schools, with 42,000 students, is one of the largest districts in Arizona and sits in a bustling urban area. Nantucket schools, on the other hand, enrolls fewer than 2,000 students and populates a small island off the coast of Massachusetts. But in early 2023 — just one day apart on Jan. 30 and 31 — both school systems...