It may not be X-ray vision, but humans’ ability to see polarised light seems to set us apart from other vertebrates.
The ability to sense this third property of light (beyond colour and brightness) is most commonly associated with bees and other insects, as well as octopuses and cuttlefish.
But few people realise they possess the skill.

What is polarised light?

Polarised light consists of light waves that are oscillating in a particular direction, much like a skipping rope being shaken up and down or from side-to-side.
Some animals, especially invertebrates, employ polarised light to navigate, find water, detect prey or predators, or for communication.
The new evidence suggests that humans use it too – or at least our ancestors did.

Why do humans need to see polarised light?

Arguably we don’t any more, but it could have been much more useful for early humans.
An ability to identify the position of the sun in the sky by recognising polarised light might once have helped humans to navigate, the researchers speculated.
This would have been especially useful in northern latitudes where the twilight period, when the sun is below the horizon but the stars are still not visible, is particularly long.

How can we all tap into this super-vision?

Most of us have to be taught how to tap into our super-vision.
The key is to watch out for Haidinger’s brushes, a subtle short-lived visual effect that occurs when we look at polarised light.
Haidinger’s brushes, named after their 19th century discoverer Wilhelm Karl von Haidinger, appear as a faint pattern of yellow and blue bow-tie shapes that fade after less than five seconds……
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Source: Breaking News