Christopher Astle and Emily Yanich were teenage pals strolling back from a 7-Eleven that afternoon in late summer -- two ordinary kids on an ordinary Wednesday after school -- when they found the abandoned baby.

It was Sept. 6, 1989. They discovered the newborn wrapped in towels at the front door of a townhouse in their Fairfax County complex and took the infant to Emily's, where her stepfather called police.

The whole thing was over pretty quickly. The authorities took the baby girl, who was later adopted. Chris and Emily, both 15, went on with their lives, although Emily often cried when she told people the story, and the two called each other every Sept. 6.

Twenty years passed.

Then, on Dec. 2, a college student named Mia Fleming sent them both a message via Facebook: Might they be the same Chris and Emily who had once found a baby left at a stranger's door?

If so, she just wanted to say thanks.

After all these years, the little girl they had found had found them.