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Timeline of discoveries and research on nanotechnology and tumor microenvironment-activated nanomotors. Milestone discoveries are highlighted. Nanotechnology research began in the 1960s. In the ensuing 40 years, nanotechnology has flourished, giving rise to the emergence of nanomotor technology [41,[45], [46], [47], [48], [49], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59]].
