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Difference Maker

Walter Lewin is 'hands on' helping students grasp physics

Whether it's swinging on a pendulum or riding a rocket tricycle, the former MIT professor, now on YouTube, finds different ways to assist students as they study the laws of physics.

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He was invited to teach at MIT in the 1960s on a one-year program and never left, taking full advantage of the impressive resources there to fine-tune his lectures.

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"MIT had a long history of physics demonstrations," he says. "I just did them in a slightly different way."

Though the lectures have an informal, unhurried look, they're the result of weeks of exacting preparation and rehearsal. On "performance day," Lewin would arrive at the lecture hall at 5:30 a.m. and conduct a full dress rehearsal.

"My timing is perfect to 100 percent accuracy [because] I dry run my lectures so carefully," he says during a recent interview at the office he still keeps at MIT.

He clearly enjoys the hold he creates on his viewers. "I can make my students sit on the edge of their seats. I can make them laugh. I can make them cry. I can make them stop breathing," he says. "I have them completely in my grip."

He admits to being a bit of a ham. "My lectures are performances ... they're like an actor on the stage," he says. "I see that as a very positive thing."

So naturally his emergence as an online star didn't surprise him. "I knew it would be a success because of my style of lecturing. Even people who don't understand physics still watch me," he says.

His ability as a lecturer is nearly legendary. "With that laserlike focus, he eliminates what's inessential to him, getting to a form of engagement that is so intense, it produces a remarkable joie de vivre," says Nancy Stieber, a longtime friend.

"He exploded onto the stage," recalls Steven Leeb, a professor of electrical engineering and computer science at MIT who once took a course from Lewin in 1984. "[He] seized us by the brains, and took off on a roller-coaster ride.... He is a genius in the classroom with an unmatched resourcefulness for finding ways to make concepts plain."

Only one of his thousands of experiments ever failed, Lewin says. He once was demonstrating how sound waves could shatter a glass, but it wouldn't break. "Some glasses are just stronger than others. It's a little bit of a tricky demo," he says with a shrug. He repeated the experiment later with the same class. It worked.

What he'll do next invites another verbal shrug. "I just got an invitation to give a talk in Malaysia," he says.

He also spends a couple of hours a day answering mail from fans, who often ask questions about natural phenomena, such as rainbows. "They think they've seen rainbows, but they haven't really seen them," he says, until they understand the physics behind the beautiful bows.

Meanwhile, physics continues to fascinate him. "[W]e're ignorant about 96 percent of the mass/energy in our universe," he writes. "Physics has explained so much, but we still have many mysteries to solve, which I find very inspiring."

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