Ancient History of West Bengal

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1.
Who did the first scientific investigation on the origin of Indian people?
2.
Which was the most significant invention during Mesolithic age?
3.
What was the major innovation during Chalcolithic culture?
4.
Where the first human fossils were found?
5.
Apart from Chandragupta, who was responsible for the expansion of Mauryan dynasty into India’s Central and Southern regions?