4.01 avg rating — 609,117 ratings

"Easy to follow . Interesting subject"

4.09 avg rating — 1,343,566 ratings

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3.83 avg rating — 931,938 ratings

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3.80 avg rating — 4,019,460 ratings

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4.15 avg rating — 10,643 ratings

"Love the colourful drawings "

4.07 avg rating — 144,425 ratings

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