his captors say he was trying to make it to niger, which has granted astyleum to one of his brothers -- astyle emto one of his brothers. i'm be back at the top of the hour. right now the good doctor. >>> hey there, i'm dr. sanjay gupta. three complicated stories that we'll make sure you understand at the end this half-hour. america's health system is changing. that means your insurance coverage is changing, as well. why the supreme court is now getting involved. then -- using stem cells to fix the damage from a heart attack. the surprising new evidence. >>> and what's behind a critical shortage of cancer drugs? >>> plus, rapper fat joe drops a body. why he's not so fat anymore. >>> in washington, the supreme court will decide a challenge to the sweeping health care law that president obama signed last year. a lot of people have been paying attention to this. the main issue is that controversial requirement that everyone be covered by insurance. it's called the mandate. starting in 2014, if you don't have coverage through a job or medicare or medicaid, you have to buy it yourself. whi