Encoding Secret Messages in Invisible Bacterial Ink. 1 minute read. Fluorescence images of BL21 ... symbol or number. Yellow and green meant H, for instance, and green and orange made I.

Now, scientists have come up with a way of encoding messages in the colours of glowing bacteria. ... digit or symbol. For example, two yellow spots signify a 't', ...

Now, scientists have come up with a way of encoding messages in the colours of glowing bacteria. ... digit or symbol. For example, two yellow spots signify a ‘t’, ...

Messages can be encoded in ice by precisely controlling the freezing rate to manipulate the size, shape, and distribution of air bubbles, enabling storage of binary or Morse code.

A METI protocol considers several factors including signal encoding, message length, information content, anthropocentrism, transmission method, and transmission periodicity.