William James Sidis, _____________ might have been the most intelligent person in history, was a child prodigy of his time.
who
His IQ was estimated to be between 250 and 300 points, _____________ is significantly higher than Einstein’s.
which
Sidis was born in Boston in 1898 to Ukrainian parents. _____________ his parents were loving and caring towards young William, they were quite pushy _____________ it came to his education.
even though / when
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