"A new molecular communications system could beam messages and data underground, underwater or inside the body, where other forms of communication aren't practical. Plants and animals use molecular signaling all the time, from sweet-smelling flowers to insect pheromones. Bees, for example, use pheromones — signaling chemicals among animals — to alarm each other when there's a threat to the hive. Now, a team of researchers has shown that this chemical language can also be used to send messages in environments where electromagnetic signals can't be used, such as in tunnels, in pipelines or underwater. "
Via Miguel Prazeres