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But the vast majority of the lessons posted on Skype in the Classroom come from teachers who want to Skype with classes abroad to expose their students to different languages and cultures — a necessity in a global economy. Think back to the old-fashioned pen pal, the tradition of writing handwritten letters to someone in another part of the country or the world. Skype in the Classroom adds video to that exchange to give students a much fuller view of pen pals’ worlds.

Teachers may need to buy a webcam and external speakers for their computers to Skype, but the service is free to download, so it seems like a low-cost tool for educators — especially at schools where budget constraints may limit field trips and funding for guest speakers. Twenty-six states are providing less funding per student to schools districts than they did last year, according to the Center on Budget and Policy Priorities.

Skype has 14 partnerships that help connect teachers with experts at Microsoft (which owns Skype), Penguin Books and the New York Philharmonic, to name a few. NASA’s Digital Learning Network partnered with the Internet phone service last month because web conferencing is dramatically cheaper for teachers to set up than video-conferencing systems, which can cost tens of thousands of dollars, according to Lead Education Specialist Caryn Long and fellow Education Specialist David Alexander. NASA would give out grants to certain schools so that they could purchase the video technology, but Long and Alexander hope their team will be able to reach more students nationwide via Skype, and therefore get more youngsters revved about STEM (Science, Technology, Engineering, Mathematics) — especially at a time when the STEM workforce is growing faster than the workforce overall. This month, NASA has started offering to teach aeronautics and “pulsar algebra,” which combines math with the study of stars.

Dr. Parry declared that “it was the single thing that changed the classroom dynamics more than anything I’ve ever done teaching.”

“Once students started Twittering I think they developed a sense of each other as people beyond the classroom space, rather than just students they saw twice a week for an hour and a half.”

During lecture, students tweet comments or questions via laptop or cell phone, while the TA and Dr. Rankin respond to a real-time feed displayed prominently in front of the room. Students who manage to live off the grid for 50 minutes can still pass in hand-written notes for the TA to tweet after class.