21.   Hopfield boldly claims that the new principle may shed light on how the human brain works.

22.   I know I often leave out words in e-mail, not by choice, but because of the way my brain works.

23.   If so, several experts said, it may overturn ideas about how the human brain works and open new possibilities for treating degenerative brain diseases.

24.   It was an unlikely scenario, but my brain was working overtime.

25.   Many toddlers stutter simply because the brain is working faster than the mouth muscles, not because they have a chronic problem.

26.   Most debate focused on whether neurological studies of how the brain works can ever explain consciousness.

27.   My brain is not working.

28.   My brain was working fast.

29.   Perhaps the brain works subconsciously on problems in the interim.