"Dear David": Pep talk box, cleaning up sidewalks and reuniting lost pets with their owners

In this week's "Beg-Knows America," CBS News contributor David Begnaud shares three stories of people helping to make a difference. A Seattle woman spreads hope with a pep talk box. Plus, a Gen Z New Yorker cleans up the city one sidewalk at a time and a veteran uses a drone to reunite lost pets with their families.