» WelcomeBackKotter

In AOL TV's continuing countdown of the best TV shows of each decade, we're back to break down the 1970s, a decade when the cop dramas were less gritty, the families were close-knit and the sitcoms were sprinkled with serious social commentary.

Our list of the best shows of the '70s features many of the best shows of all time (here's looking at you, 'Mary Tyler Moore Show,' 'M*A*S*H' and 'Taxi'). Take a gander and let us know if you agree.

Beverly Hills, 90210 ... 21 Jump Street ... The Facts of Life ... see where they rank on our list.

The bad news? Summer's almost over and it's nearly time for school again.

The good news? We've got just the thing to ease you into back-to-school mode: Our countdown of TV's 21 best school shows ever.

So sharpen your No. 2 pencil and dive in to see which series just make the grade and which ones are at the top of the class.

Whatever happened to Horshack, Boom Boom and the other Sweathogs?

Before John Travolta was a big-time movie star, he was underachieving Sweathog Vinnie Barbarino in the hit sitcom 'Welcome Back, Kotter' (1975-79).

With a movie in the works starring Ice Cube as Mr. K., it's a perfect time to welcome back the original 'Kotter' crew and see where they've been since they dropped out of prime time.

Read on to see who's still acting, who's switched to professional poker... and who threw down on 'Celebrity Boxing.'