If you grew up watching American TV, there's a good chance you've seen at least a little bit of the hospital drama ER. But if you've wanted to watch it online, your legal options have been limited unless you've been willing to buy it from services like iTunes. However, it just got considerably easier... for some people, at least. Hulu has announced that it's now the first and only place where you can stream all 15 seasons of ER. If you want to see what George Clooney was doing before he became an A-list movie star (or directing Hulu originals), you just have to fire up a web browser.