Imagine you’re a high school biology teacher searching for the most vivid way to explain electrical activity in the brain. How about inserting metal wires into a cockroach’s severed leg and making that leg dance to music? Starting Monday, that eye-popping lesson, performed in a six-minute video by neuroscientist and engineer Greg Gage, is available free online, the Washington Post reports. TED, a nonprofit organization that produces a popular annual conference on ideas, is launching TED-Ed, an online collection of lessons it hopes will bring the best educators to any classroom with an Internet connection.

“Right now there’s a teacher...

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