Being a single mom has taught me to stretch every dollar and notice small kindnesses. My seven-year-old, Lily, is pure sunlight—curious, bright, tender. Yesterday we left the store with a pack of pencils for school, and a small lemonade I let her grab at checkout. Just outside, Lily stopped. A man sat against the wall, shoulders shaking. People rushed past like he was part of the wall. "Mom, did you see that man crying? What's wrong with him?" "I don't know, sweetheart. Maybe he's sad." "Maybe h