In the long effort to read the body's cellular language without disturbing it, a research team has found a way to listen to four conversations at once. By threading multiple microfluidic channels through a single electrical detector and training a neural network to untangle the overlapping signals, they have made it possible to profile the biophysical state of individual cells — including rare immune cells that govern allergic reactions — without dyes, labels, or the slowness that has long constrained the field. The work sits at the intersection of telecommunications engineering, biophysics, a