We recently had a rainy weekend interrupt our original plans to go geocaching. Instead, I took inspiration from John Baichtel's recent posting - Codes For Kids - to introduce my kids to ciphers.

The trick here is that your eyes get used to the pattern right away. Once the brain sees row after row of the same figure, it stops searching for anything unusual. That is why the odd number blends in ...

A brand new optical illusion is making waves online, challenging viewers to spot a cleverly hidden number in a sea of lookalikes. Solving the challenge is easier said than done. Only the most focused ...

The trick lies in repetition. Once the brain sees the same number appear dozens of times, it stops paying close attention. Psychologists often call this “visual fatigue.” Your eyes are scanning, but ...