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Q&A Realistic "Titan hardening" for living creatures: what's the hardest substance a biological process can produce?

SPOILERS FOR ATTACK ON TITAN, READ AT YOUR OWN RISK... Hardening, or Titan hardening is an ability posessed by certain types of titans in the anime Attack on Titan. Since the setting has rifles ...

4 answers  ·  posted 5y ago by Mephistopheles‭  ·  last activity 5y ago by Mephistopheles‭

Question materials chemistry biochemistry