Remember learning fractions?

Corey Simmons, 42, of New York City, has a third grade son who flunked a math test about fractions. While riding the subway, Simmons struggled with a paper full of fraction problems he hoped to solve so he could teach his son how to do them. But he was stuck.

Before long, an older man got on and sat down next to him. He asked Simmons what he was doing, and Simmons explained he had not studied fractions for over 30 years, so he was having a hard time. By coincidence (?) the older passenger was a former math teacher and offered to help Simmons help his son. A woman across the aisle heard the entire conversation and posted this photo on Facebook, where it's been shared 40,000 times.