Отворени данни в реално време за раждаемостта в България. Uncontacted Tribe Photographed in Brazilian Jungle. Clive Thompson on Secret Messages in the Digital Age. Illustration: Jennifer Daniel In 440 BC, the Greek historian Herodotus first described a trick that spies used to send hidden messages.
They’d write something on the wooden back of a wax tablet, then cover the message with wax bearing its own message. If enemies intercepted the tablet, they wouldn’t suspect it contained anything strange. It’s called steganography: hiding one message inside another.