Here's a challenge that separates the keen observers from the rest: A deer cunningly lurks within this lush jungle painting.

The image showcases a stunning jungle scene, beautifully stylized to capture the essence ... But here’s where the challenge begins—hidden somewhere in this picturesque setting is a deer Scientists ...

Brain teasers exist in numerous interesting ways—some challenge your mathematical skills, others challenge your logical mind, and there are optical illusions that play tricks on your brain.