Remember Iron Man's Mark 50 suit from Avengers: Infinity War? Tony said that it's nanotech, but in reality current nanotechnology is not yet able to make this suit. Recent research by Sun S. and colleagues can potentially be a step towards it!

Lit Paper:

Sun, S., Yang, S., Xin, H.L. et al. Valence-programmable nanoparticle architectures. Nat Commun 11, 2279 (2020). 

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Iron man from ClipartKey