In short, a relentless, endless free diet of fast media is bad for your brain.

FORBES: Medialand

Malaria, too, is bad for the brain.

ECONOMIST: Disease and intelligence

Chronic stress, of course, has been shown over and over to be a bad thing for body and brain.

FORBES: Is A Little Stress A Good Thing For The Brain?

Some 20 million pairs of eyeballs have glommed on to the site this year, and logged off with the hamster song rattling away in their brain like a bad Boney M song.

CNN: ASIANOW - TIME Asia | Asia Buzz: Great Balls of Fur

In patients with dementia, the symptoms of brain cells dying, bad sleep and memory loss are far far worse than in normal ageing.

BBC: Boosting sleep 'may slow memory rot'

"You keep getting on elevators and nothing bad happens, so your emotional brain decides that even though something horrible happened, the risk is not high for you, " he says.

WSJ: After Fatal Manhattan Elevator Accident, Elevator Fear Is Common

We prefer to avoid awkward scientific findings on the biology of violence that question our concepts of free will and punishment and harken back to the bad old days of eugenics and brain lobectomies.

CNN: Opinion: Unlocking crime using biological keys

In my book, I argue that we should instead grasp the neuroethical nettles that threaten to choke the growth of the new field neurocriminology, recognize that there is more to crime than bad environments, and attack the brain basis to violence.

CNN: Opinion: Unlocking crime using biological keys

Research shows clearly that the human brain retains more from the bad memories than the good.

FORBES: Why Screw Ups Make For The Best Summer Vacations

Brain drains are usually a bad thing, but the latest exodus of veterans may make more of a contribution to Google than they would have if they were rich and bored inside the company.

FORBES: Magazine Article