In May 2011, scientists announced that an autopsy of the brain of former Chicago Bears safety David Duerson, 50, who died from a self-inflicted gunshot wound, showed evidence of "moderately advanced" chronic traumatic encephalopathy, or CTE.

CNN: NFL wants players' suit over concussions dismissed

If you finish Singh's code book and want to tax your brain even more, go back to David Kahn's 1, 200-page The Codebreakers, a classic that came out in 1967 and was recently updated.

FORBES: I've got a secret

So by 1990 China had a brain drain, and this prompted a row within the government, notes David Zweig, a Hong Kong-based scholar.

ECONOMIST: Higher education

For the new research, published in the Archives of General Psychiatry, David Tolin of the Institute of Living in Hartford, Connecticut, recruited 107 people for brain scans using functional magnetic resonance imaging (fMRI).

CNN: STORY HIGHLIGHTS

New Zealand international Rory Fallon made his Aberdeen debut while goalkeeper Brown deputised for the unavailable David Gonzalez, with Jamie Langfield on the bench for the first time since suffering a brain seizure during the summer.

BBC: Sport - Aberdeen 2-2 Kilmarnock

Dr. David Amaral of the MIND Institute says the team used automated techniques to estimate the number of brain cells in each amygdala.

NPR: New Autism Study Shows Discrepancy in Brains

An Australian, David Rock, has proposed a useful way of looking at human needs and how they relate to fundamental brain functioning.

FORBES: Is What We Need From Leaders Prewired Into Our Brains?