Direction finding in partly calibrated arrays has received significant attention in recent years. From the perspective of the calibration imperfections, existing literature predominantly focuses on ...

The challenge is to find out the Odd Number “16” in this Numerical Optical Illusion. Can you prove you have an IQ level of 169 or higher with 20/20 vision?

Find the 2o2 in the grid of 202s in just 12 seconds. Only 1 in 10 people can complete this challenge. Optical illusions are spreading like wildfire on the internet.

Only 1% can spot the hidden odd number in this ‘421’ numerical optical illusion. Test your observation, IQ, and Hawk–Eye vision in this fun brain teaser.

There's one thing that's a constant in the human experience: finding odd little thingamajigs and having no idea what they are. Before the internet, we'd probably have just given up and been left ...