Humanity, under
the microscope

One cell copies its genome, lines it up on the spindle and splits in two. A family grows the same way: one becomes two, and the tissue is one cell bigger.

An orderly exit: the cell shrinks, blebs, breaks into parcels and is cleared, and its neighbors close the gap. Tissues stay alive because their cells do not.

Cells grip each other through junction proteins; people through trust and time. Strangers meet, junctions form, and a cluster becomes one body.

Two membranes merge into one cell that keeps both nuclei. A marriage, an alliance, a merger: one body, with two identities still alive inside it.

A large cell reaches around a small one and swallows it whole, then digests what it took. Acquisitions, annexations and assimilation follow the same choreography.

Bacteria count each other through the molecules they leak. Below a threshold, nothing happens; above it, every cell switches on at once. Movements tip the same way.

Cells sense a chemical gradient and crawl up it, leading edge first. People follow gradients too: work, safety, family.

An intruder is detected, guards converge and the threat is cleared. Armies, police, customs, quarantine. Overreaction has a name too: autoimmunity.

Each side makes what the other lacks, and both grow. Every trade route is membrane transport between two organisms.

One stem cell, four fates: a signaling cell, a contractile cell, a carrier, a secretory cell. Specialization turns a crowd of cells into an organism, and a crowd of people into an economy.

Starving tissue calls for blood and a vessel grows toward it. Roads, power lines and cables are built toward the places that call loudest, and life follows them.