When zero was first discovered

The invention of zero, or rather the realisation that it was a number just like any other, was one of the greatest conceptual leaps in the history of mathematics, one that would spur the rise of modern science.
Today it is announced that the written record of zero in the region which discovered this influential digit dates back four centuries further than most scholars had thought, thanks to carbon dating of an ancient manuscript written on 70 leaves of birch bark, held at the University of Oxford’s Bodleian Libraries.
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