The German village where the seasons determine how the mail gets delivered

You might know that spring is here by how late the sun stays up, or by the sight of picnics in the park. In the small German village of Lehde, the arrival of spring is marked by the local post office delivering mail on a barge. That's because the village is linked by a network of canals that function as both a historic irrigation system and the best way to get around. Host Marco Werman has more details.