. >> still ahead at 4:00 excuse yahoo ceo marisa mayer has for missing a major marketing meeting >> how a 4-year-old boy went out of his way to make a difference. >> i'm michael finney. if you play online game flappy bird, you can be putting yourself at risk. has atrial fi, or afib. he has the most common kind... ...it's not caused by a heart valve problem. dad, it says your afib puts you at 5 times greater risk of a stroke. that's why i take my warfarin every day. but it looks like maybe we should ask your doctor about pradaxa. in a clinical trial, pradaxa® (dabigatran etexilate mesylate)... ...was proven superior to warfarin at reducing the risk of stroke. and unlike warfarin, with no regular blood tests or dietary restrictions. hey thanks for calling my doctor. sure. pradaxa is not for people with artificial heart valves. don't stop taking pradaxa without talking to your doctor. stopping increases your risk of stroke. ask your doctor if you need to stop pradaxa before surgery or a medical or dental procedure. pradaxa can cause serious, sometimes fatal, bleeding. don't take pradaxa if