The lazy racism which describes tribal people as ‘primitive’ and ‘backwards’ is now being challenged wherever it occurs. Like all human societies, theirs are constantly changing and developing. Accusations of savagery are as wide of the mark as doomed attempts to ‘preserve’ living cultures.

An Invisible Man with perfect vision sounds like a superhero from a comic, but may be close to reality thanks to scientists at the University of St Andrews. A team of physicists are one step closer to creating a Harry Potter-style invisibility cloak, with a new form of material that could also be attached to contact lenses to provide ‘perfect’ eyesight.