Journalists have uncovered a handful of preprint academic studies with hidden prompts instructing A.I. reviewers to give ...

A “secret” message hidden inside a square made up entirely of dots is officially freaking the internet out because it “disappears” once you see it.

To reveal the hidden message, you need to challenge your brain’s natural shortcuts and focus intently. ... The "Hide and Seek" illusion hides text within its woven background.

Secret Conversations have a black background instead of blue. Related: Facebook apologizes for weird things on Marketplace. The feature can be turned on when starting a new message within Messenger.

This means that under UV light, the message shows up as black “ink” against a bright green background. The message can be erased by heating the paper with a hairdryer for 15 to 30 seconds.

Scientists have devised a way to communicate secretly by sending laser-transmitted messages directly into the area around a person’s ear. Humans enjoy ...