Tiny nanobots able to self-organise into useful structures, materials, tools and machines might one day transform the world of engineering, writes resident sci-fi author Gareth L. Powell. I'm a big fan of Lego. As a kid in the 1970s, I had a cardboard box filled with bricks of all different shapes and colours. Individually, the pieces of Lego were small and not very useful, but with a little imagination, I could use them to build almost anything.
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