The document discusses nanorobotics, which involves building devices at the nanoscale using molecular manufacturing. Nanorobotics research involves both simulation of nanoscale dimensions and microscopic manipulation. Potential applications of nanorobots in medicine include curing diseases, replacing immune functions, and detecting pathogens. Fractal robots are also discussed as a potential intermediate technology using modular blocks that can rearrange themselves. Fractal robots may one day enable self-repair and construction of complex structures like space stations. While nanorobotics research continues, fractal robots present more feasible near-term applications.