there is va rasty to the idea that activists are picking good stories under valued. >> fascinating stuff. thanks a lot. >>> still ahead, supersized hospitals, the sector is being hit by mergers but will the recent trend drive up the cost of care for you but first, some of the most widely held stocks closed today. >>> picture this, a 100-foot sink hole swallows a resort outside of disneyworld and a day after the earth opened up, there is questions about the safety of homes across the state and how it will affect the housing recovery. diana olick has more from florida. >> reporter: engineers with drills rolled into summer bay as developers here assess the damage and try to make sure the other 52 buildings in this report are safe. >> we expect insurance people and our adjustors to be here today to start work. it's too early to say what will happen. >> reporter: the building is a total loss but they will continue to develop this area, even though it's prone to such sink holes. across central and western florida there are more than 19,000 known sinkholes and likely more unknown. >> basically