In this video, Motley Fool health care analyst David Williamson takes us through some of the biggest investing stories in the health care space yesterday. He tells us about Ligand's (NASDAQ:LGND) big FDA win -- and why its relevance may be very short-lived -- and how AVEO Pharmaceuticals (NASDAQ:AVEO) is bouncing back after taking a big hit last week and what's ahead for the company. He also discusses how pharmaceutical giant Pfizer (NYSE:PFE) doesn't always get what it wants.