Headlines outran the copies

In 2021 a C-shaped Xenobot, a little like a Pac-Man, rowed through a dish of loose cells and packed them into a pile. The pile, after a few days, could move. Headlines said living robots can now reproduce.

What happened was kinematic copying: making a look-alike by moving spare parts, the way a machine might assemble a twin from a warehouse. It is not an egg. It is not sex. After a generation or two the piles shrink and the line stops unless a person keeps pouring in spare cells. One of the builders said you will never see this in a pond unless the pond is impossibly full of frog stem cells.

John Timmer wrote the careful version: interesting research, not reproduction, language that ran ahead of the figure. Believe the figure.

This page exists so a local invent does not start from a sci-fi breeder. The real surprise is still competence: wild-type cells found a job nobody wrote into the genome. The false surprise is a species of robot frogs.

The tempting mistake is to invent a swarm, a factory, or a containment panic scaled for a breeding machine.

That is what lets you write the honest limits without flinching.