Vital signals arrive and depart constantly at every scale. Information enters us through our eyes and ears and olfactory systems, as well as other senses we're still in the process of inventing. At the cellular level, biochemical messages are shuttled, though a complex dance of proteins, across the lipid membrane, perhaps to trigger a cell line to differentiate. At larger scales, we seek signals from farther out, as satellites collect data and beam their messages back to Earth. But beware of the signals you receive from social media: they might just melt your eyes.
