The first hint to crack the puzzle "What Isaac Newton was under when hit on the head" is:

It is a word which contains 9 letters

The second hint to crack the puzzle "What Isaac Newton was under when hit on the head" is:

It starts with letter a

The third hint to crack the puzzle "What Isaac Newton was under when hit on the head" is:

It ends with letter e

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The answer for the puzzle "What Isaac Newton was under when hit on the head" is: