Optical illusion puzzles have been there for centuries and these are fun challenges that are designed to play tricks on our eyes and brains. Optical illusions work on a simple principle where it ...

Optical illusion puzzles have been there for centuries and these are fun challenges that are designed to play tricks on our eyes and brains. Optical illusions work on a simple principle where it ...

A viral brain teaser challenges observers to find a hidden '23' amidst a sea of inverted '32s'. This illusion plays on pattern recognition, making it difficult to spot the subtle difference.

A carefully thought out method of harvesting and arraying tissue samples into blocks provides a simple but powerful way of reliably producing extremely large tissue microarrays using commonly ...