The goodwill of the Olympic Games appears to be thawing relations between North and South Korea. The North's leader, Kim Jong Un, invited South Korea's president to Pyongyang for a summit, in the hopes of easing tensions between the rival nations. The message was delivered by Kim's sister, just hours after the Winter Games opened in South Korea.

A wild week on Wall Street came to an end with a small rally on Friday. I joined CBS This Morning to explain why such volatility might not be a bad thing.