askhistorians

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Why, after ~200,000 years of non-agricultural homo sapiens, did the neolithic revolution take place independently in multiple places in such a short period of time (<10,000 years)?	388
Did the Roman Empire use a single standardised currency? If so, how far would a coin be likely to travel across the empire before being lost/melted down?	245
As Russia expanded East into Siberia, did it encounter/conquer any pre-existing Kingdoms of any sort? Also, how were the people who lived in Siberia assimilated into Russia?	172
What are the origins of mathematical symbols like "+", "-" and "="? Have they always been used (since we've had need for them at least), or were other symbols used in the past?	166
What caused the massive expansion of the Celts around the 5th and 4th century BC? Going from a small group in Southern Germany to covering much of Europe in just 250 years.	62
Before Proto-Indo-European spread into Europe, was there a dominant language family throughout the region? Or was it made up of many different language families?	36
Are all the Pharaohs of Egypt known? Do all of them have known tombs/pyramids?	34
We all know of the destruction of the ancient Libraries of Alexandria, Baghdad, Ephesus, etc... are there any major libraries of history which survive to this day, or at least there contents did?	30
Demographics of Sub-Saharan Africa often give a large % believing 'local' or 'indigenous' religions. What is the nature and history of these religions? Are they related? Are they polytheistic?	13
What was the approximate population of pre-Roman Britain during the iron age, and how did this compare to the population after Roman conquest?	11

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