More people know about hospital acquired infections and medical errors than you might think, and not just from watching Oprah.

I’d like to point you to four brave patients, who debuted their videos to lawmakers at the Massachusetts State House and encouraged them to take an active role to improve patient safety.

Did you catch the Oprah Winfrey Show on Tuesday about medical mistakes? She featured actor Dennis Quaid who recalled the series of hospital errors that nearly killed his newborn twins after they were given one thousand times the amount of the blood-thinning drug Heparin—twice.