In 1966, a scientist was given the assignment of coming up with a symbol: one identifying biohazardous materials. You probably know it well, and that's in the design -- it was supposed to be uniquely representable, and pervasively memorable. Today, the etc. Group is sponsoring a contest for a similar symbol: a symbol for nanotechnology hazards. It's reasonable to believe that a day will come when nano-objects, unseen but deadly, will be present in our world. See also.
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