A book is made of wood. But it is not a tree. The dead cells have been repurposed to serve another need. Now a team of scientists has repurposed living cells — scraped from frog embryos — and assembled them into entirely new life-forms. These millimeter-wide “xenobots” can move toward a target, perhaps pick up a payload (like a medicine that needs to be carried to a specific place inside a patient) — and heal themselves after being…

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Source: archeo