>Communication is exchange of information. exchange actually does too much heavy lifting here. This almost passed, but no; communication is the transfer/moveme

>Communication is exchange of information. exchange actually does too much heavy lifting here. This almost passed, but no; communication is the transfer/movement of information. One-way communication can convey (even if requiring a previously agreed upon compression mechanism) information - even a single bit or even the existence of a signal at all can be used - think about using the time between signals as a medium, etc. Heartbeat signals (inverted dead-man switches) exchange information; it doesn't have to be the same type. The beat source explicitly proclaims it's existence in space-time and the receiving end can infer it's existence at a certain time. Like natives' smoke patterns of Morse code of radio waves, using periodicity to convey bit value