"A new page in relations:" That's how Iran's president described this week's nuclear deal. We'll hear more from Iranians looking forward to the day when sanctions might be lifted. Also, in the Rio Grande Valley, just on the other side of the border, there are hundreds of small communities, and many of them don't have street lights. Residents have launched the aptly-named Right to Light campaign, and it seems to be working. Plus, we'll tell you about the mystery and intrigue surrounding a giant emerald in Brazil that keeps on disappearing.