Looking at his latest offering he could well be:
Really Denis? Are you sure? Did you check out that surprising factoid to see if it was true or one of the hoariest urban myths of all time?
"Most people use only three to four per cent of their total supply of brain cells."
Oh, apparently not:
"Where do brain myths come from, and why are they so persistent? The origin of the 10% claim remains uncertain, despite considerable research. It is often attributed to William James, who expressed a similar idea in a 1906 speech to the American Psychological Association: "Compared to what we ought to be, we are only half awake. We are making use of only a small part of our physical and mental resources." But the 10% number has not been found in any of James' writings. Alternatively, the myth may have originated from an early misinterpretation of interneurons as undeveloped neurons, leading to the speculation that they might be a reserve pool or neural replacement later in life. Another potential source of this myth is the difficulty encountered by early neurophysiologists, notably Karl Lashley, in identifying functional defects caused by lesions of particular brain regions. Indeed, the term 'silent cortex' was once commonly used to describe regions without a clear sensory or motor function, and this could easily have been misinterpreted to mean 'unused cortex'." (from Nature Neuroscience, but pretty much anyone with even the slightest familiarity with psychology or neuroscience could have told him that it was nonsense)