William Abel, a mail censor at Iowa's State Prison, Fort Madison, using a hot iron to bring out a secret message written in lemon juice on a letter.Three Lions/Getty Images Humans have had a long ...

A Hillhouse student’s eyes widened as he applied grape juice and heat to what appeared to be a blank piece of paper — but instead held a secret message in invisible ink, written as part of a course ...

It is a classic rite of passage for nerdy kids to write secret messages using lemon juice. If you somehow missed that, you can’t see the writing until you heat the paper up with, say, an old-fashioned ...

Write and hide secret codes using invisible ink. Michigan couple charged with making millions off hiring illegal immigrants Secretive Border Patrol program is detaining US citizens for ‘suspicious’ ...

More than 80 years after the end of World War I, the United States still won't give up the secrets behind a surreptitious tool used by the Allied forces: invisible ink. A public interest group filed a ...

Advancements in artificial intelligence (AI), especially large language models (LLMs) like ChatGPT and open-source counterparts, are reshaping how people communicate daily. These AI systems generate ...

It's a 400-year-old North Carolina mystery that may soon be solved. Historians call it The Lost Colony. It's a group of people who disappeared from Roanoke Island between 1587 and 1590. A map from ...