A captivating optical illusion tests your observation skills. Initially, the image shows just one man on a secluded beach, but there's a hidden second man to discover. Try some other tips that ...

For those that love optical illusions – and a good explanation for the mind-bending properties of them – finding one you haven't seen before is a real treat. And that's just happened with this (I ...

Are you ready for a mind-bending challenge? This optical illusion has taken the internet by storm, leaving many puzzled. It's one of the trickiest visual illusions online, and only the sharpest ...

The smooth wings of fruit-sucking moths appear to be ridged like a leaf – but the resemblance is created by nanostructures ...

Many optical illusion images are designed by blending objects, colours, etc. These elements are strategically arranged to create deceptive effects, making hidden details appear or disappear.

This optical illusion challenges your observation skills by hiding the number "11" among a pattern of "12" and "21." Many ...

Optical illusion personality tests, featuring images like a frog or a horse, offer insights into people's traits based on ...

Optical illusions are mind-bending puzzles that trick your brain into seeing things that aren’t there—or hiding what is. They test your perception, push the limits of your observation skills ...

The biggest stories of the day delivered to your inbox.

We review basic principles of modern optical magnetometers, discuss fundamental limitations on their performance, and describe recently explored applications for dynamical measurements of ...

Optical techniques are methods that use light to probe or control matter. One prominent example is optical spectroscopy, which includes such methods as pump–probe spectroscopy, Raman ...

Our expert, award-winning staff selects the products we cover and rigorously researches and tests our top picks. If you buy through our links, we may get a commission. Executive Editor David ...