Source: LIVE SCIENCE, 6/13/21


Crows may be bird-brains, but the feathered creatures can understand the highly abstract concept of zero, new research suggests.  The concept of zero, as used in a number system, fully developed in human society around the fifth century A.D., or potentially a few centuries earlier, Live Science previously reported. For instance, the notion of multiplying 8 by 0, or adding 0 to 10, didn't emerge until then. The concept of "none," or the absence of any quantity, likely emerged earlier, but this differs from using zero as a distinct "quantity," in and of itself.

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