biology

The immune system's most important skill is restraint — knowing what not to attack. When that tolerance fails, the body turns its full arsenal on itself. Here's what goes wrong.

Planarian flatworms are functionally immortal and can regenerate any body part — including the brain — from a fragment as small as 1/279th of the original animal. The signals that coordinate this feat, including bioelectric gradients, are giving regenerative medicine a new vocabulary.

Genes are the recipe, but something else sets the table. Morphogenetic fields — gradients of chemical signals and bioelectric patterns — tell each cell where it is and what it should become. The body's shape is information, stored outside the genome.

Before a cell divides or differentiates, it checks its voltage. Membrane potential (Vmem) is a signaling layer that sits above the genome and shapes what a cell becomes.

Electricity in your body isn't just about neurons firing. Every cell maintains a voltage, and the body's bioelectric fields do things neuroscience is only beginning to map.

Bioelectricity predates the nervous system by hundreds of millions of years. Evolution kept it because it solves a hard problem: how do cells that can't see each other coordinate into a coherent body plan? The answer is elegant and still being decoded.