An Egyptologist deciphers secret messages hidden for 3,000 years in the Luxor obelisk that millions see every day.

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 ...

The old practice of hiding words or symbols, or engraving letters too small to be read, has come into favor again. By Victoria Gomelsky In 2014, Fie Isolde’s future husband wrote her a 28th birthday ...

The House committee investigating the Jan. 6, 2021, riot at the Capitol on Thursday publicized freshly obtained communications from the Secret Service showing agents were aware of concerns about ...