You can write an Invisible Secret Text Message in an Image File, by following this trick laid down in this post. All you need is the Notepad!

Introduction If you need to send a secret message to a friend, how could you prevent other people from reading it? One way is to encrypt the message—that is, use a secret code that only you and ...

Would it be possible to interpret a message and a language not only from a different species, but from entities from another planet?

This “extraterrestrial message” was created by artists and scientists for a project called A Sign in Space, which challenges people around the world to interpret an imagined alien signal.