If the myth of pure evil is that evil is committed with the intention of causing harm and an absence of moral considerations, then it applies to very few acts of so-called 'pure evil' because most evildoers believe what they are doing is forgivable or justifiable.

All over the world, belief in the supernatural has authorised the sacrifice of people to propitiate bloodthirsty gods, and the murder of witches for their malevolent powers.

I think that metaphor really is a key to explaining thought and language. The human mind comes equipped with an ability to penetrate the cladding of sensory appearance and discern the abstract construction underneath - not always on demand, and not infallibly, but often enough and insightfully enough to shape the human condition. Our powers of analogy allow us to apply ancient neural structures to newfound subject matter, to discover hidden laws and systems in nature, and not least, to amplify the expressive power of language itself.

Like the early days of the Internet, the dawn of personal genomics promises benefits and pitfalls that no one can foresee.

In many Muslim countries, witchcraft is not only on the books as a crime, but is commonly prosecuted. In 2009, for example, Saudi Arabia convicted a man for carrying a phone booklet with characters in an alphabet from his native Eritrea, which the police interpreted as occult symbols. He was lashed three hundred times and imprisoned for more than three years.

Many artists and scholars have pointed out that ultimately art depends on human nature.

The last 100 years of research into the human brain...sees the brain as an organ that works by physical principles just like the other organs in the body...our emotions and higher callings, such as religion, as well as our grubby low-level physical systems like stereo vision and motor control, are products of a machine.