Divide and Conquer

When my daughters were in grade school, they loved to use colored strings to weave friendship bracelets for their classmates. Typically, though, Maria and Katrina became frustrated early in the process because their colored strings had become a tangled mess, and the girls had a hard time picking out the four colors they wanted to use for their bracelets. Inevitably, they’d come to me and ask, “Daddy, can you help us untangle this ball of string?” Though…