Valve has opened a new "Steam for Schools" initiative, offering a specially-designed and free version of Steam to educators. It's kicking off the new program with "Teach with Portals," a free version of Portal 2 and the Portal 2 Puzzle Maker offered through SoS to teach kids about science, technology, engineering, and math. And who better to show kids a passion for science than GLaDOS?

The official site (via Joystiq) details the program, which is now in beta. It makes educators the administrators of the limited version of Steam, so they can oversee their kids learning about physics and math using the game and tools.

It already hosts a number of lesson plans for physics and math, including ones on spatial visualization, parabolas, gravity, terminal velocity, and conservation of momentum, among others. The site hints that eventually it will host lesson plans at chemistry, game design, and language arts.

The FAQs detail how to apply. If you're an educator, you'll need to provide contact information for your supervisor and the organization, the subject, the number of computers, and the number of students. After that, your kids can learn about physics while GLaDOS complains about being a potato.