Just before the school year ended, 11-year-old Mary Lou Street of Northfield, Minn., got an important math lesson:
The generous actions of a few people can grow far bigger than the sum of their parts.
Mary Lou is a fifth-grader at Greenvale Park Elementary. In early May, she and her peers learned about the plight of Ukrainian children through a Scholastic magazine article and video. Determined to do something, a few students including Mary Lou decided to make bracelets in the Ukrainian colors of blue and yellow and sell them for a few weeks at the local farmers market.
Eventually, they invited three other local elementary schools to join them, potentially expanding their effort from 60 students to more than 250. Offerings grew from bracelets to key chains with leather tassels, sunflower earrings, buttons and more.

A temporary home at the market became a regular weekly presence all summer. A few hundred dollars became nearly $5,000 for the Alight Ukrainian response fund.
And the four feeder elementary schools are working now to create a service club when they all meet up in the fall in middle school.
"We all think it's kinda insane," Mary Lou said. "One kid puts in just a little, but then you have a lot of kids in total and you have this amazing reward."

A difficult lesson