THE LIMIT IS, AT LEAST, THE UNIVERSE:

[A]t what size do quantum effects no longer apply? How big can something be and still behave like both a particle and a wave? Physicists have struggled to answer that question because the experiments have been nearly impossible to design.

Now, Arndt and his team have circumvented those challenges and observed quantum wave-like properties in the largest objects to date--molecules composed of 2,000 atoms, the size of some proteins. 

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