Vagus nerve stimulation has been used for more than 20 years to treat conditions like epilepsy, but it usually involves surgery to implant electrodes so they are directly in contact with the nerve in the neck

Now some smart folk at the university of California and San Francisco have developed an ear bud that connects directly to your brain and helps people learn unfamiliar sounds new languages. 

The device has been tested on 36 English speaking volunteers, the device is so advanced you are not aware its actually working. out of the 36 test it seems to have worked on 2/3 of the test group.

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