The Norse god Odin still looms large in western popular culture. In Marvel’s Thor films, he’s portrayed by a gnarled Anthony Hopkins as the greatest warrior in all the nine realms of Norse mythology. In the wildly popular God of War video games, he’s an arch villain – the “all-father”, who must be defeated to claim victory. But despite his contemporary popularity, Odin is remarkably ancient. And as researchers recently found, he’s even older than historians first thought. A new discovery places the earliest recorded mention of Odin in the early fifth century. And there was more to the deity than power and might. He was also a shapeshifter, a shaman and maybe even gender fluid – as our expert explains.

Leading theories in the realm of Alzheimer’s research generally suggest that the disease is caused by an abnormal accumulation of certain proteins, which lead to tangles in the brain. But a new theory suggests a different trigger – damage to the brain’s energy-producing structures.

Elsewhere, the government continues to operate a deterrence approach to the small boats crossing the Channel in hope of asylum. But, as a border policing expert explains, cracking down on smuggling just makes gangs more organised and the routes more dangerous.

Anna Walker

Senior Arts + Culture Editor

Is Norse god Odin older than previously thought? An expert analyses new evidence

Marianne Hem Eriksen, University of Leicester

The discovery of the oldest recorded mention of the Norse god Odin pushes the age of this deity back at least 150 years.

Alzheimer’s disease: problems with the brain’s energy supply could be a cause

Afshan Malik, King's College London

Mitochondria, which are found in every cell in the body, play an important role in brain function.

Illegal immigration: cracking down on smuggling makes gangs more organised – and costs migrant lives

David Suber, UCL

Arresting smugglers is difficult, and doesn’t make migrants less likely to seek out their services.

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