The meaning of the term 'I had to bold it here' is representing the ideas being initiated by Newton.
Who was Newton?
Newton was a renowned mathematician and a scientist who developed many laws of physics.
From the given excerpt, the term which is being underlined is 'I had to bold it here'. This is representing the ideas and perspectives in accordance with the scientific analysis of Isaac Newton. He gave many scientific theories which are still being utilized in the science fields.
Therefore, the ideas developed by Newton represent the underlined words of the given excerpt.
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