(NPR) — Welcome to the 21st century classroom: a world where students watch lectures at home — and do homework at school. It’s called classroom flipping, and it’s slowly catching on in schools around the country.

When Jessica Miller, a high school sophomore in rural Bennett, Colo., sits down to do her chemistry homework, she pulls out her notebook. Then she turns on an iPad to watch a video podcast. Whenever the instructor changes the slide, Miller pauses the video and writes down everything on the screen.

Miller can replay parts of the chemistry podcast she doesn’t understand, and fast forward through those that make sense. Then she takes her notes to class where her teacher can review them.

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