craft was practiced in China during the Tang Dynasty around ad 600 (and might have been in use as early as ad 200), but was mastered by Europeans only in the eighteenth century.8 Wheeled vehicles appeared in several sites across Europe and Mesopotamia around 3500 bc but reached the Americas only in post-Columbian times.9 On a grander scale, the human species took tens of thousands of years to spread across most of the globe, the Agricultural Revolution thousands of years, the Industrial Revolution only hundreds of years, and an Information Revolution could be said to have spread globally over
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