25000-35000 B.C. Time of paleo-Indian migration to Americas from
Siberia, according to genetic evidence. Groups likely traveled across
the Pacific in boats.
Wheat and barley grown from wild ancestors in Sumer. 6000 BC
5000 BC In what many scientists regard as humankind's first and
greatest feat of genetic engineering, Indians in southern Mexico
systematically breed maize (corn) from dissimilar ancestor species.
3000 BC The Americas' first urban complex, in coastal Peru, of at
least 30 closely packed cities, each centered around large
pyramid-like structures
Great Pyramid at Giza 2650 BC
32 BC First clear evidence of Olmec use of zero--an invention, widely
described as the most important mathematical discovery ever made,
which did not occur in Eurasia until about 600 A.D., in India (zero
was not introduced to Europe until the 1200s and not widely used until
the 1700s)
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