Whatever Happened to the Mars Rovers?

Natural Quasicrystals First cooked up in the lab in 1984, quasicrystals are unusual substances that lie somewhere between the crystalline and the amorphous. Specifically, they display ordered arrangements and symmetries but are not periodic–that is, they are not defined by a single unit cell (such as a cube) that repeats itself in three dimensions [see “Quasicrystals”; SciAm, August 1986].

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