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You know the feeling when you hit it off with someone so well you start finishing each other’s sentences. You are not imagining it. Your brains are physically aligning.

Researchers looked at a decade of data using portable EEG headsets. They found that when people genuinely engage, their brainwaves sync up. It works exactly like a biological Bluetooth connection.

When you get on the same wavelength as someone, you feel it. Students in synced classrooms report enjoying the lessons significantly more. But there is a catch. People who identify as lonely exhibit noticeably lower levels of this natural alignment.

Now, scientists are testing if we can train people—like therapists and patients—to sync up on purpose.