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Although research into reciprocity uses well-controlled procedures, it is hard to know what is actually going on from the perspective of the baby. Gratier observed that many children display the same faci...

Michael and Hanna are 15 and 36 years old, respectively, at the start of the novel. This is important, as she is old enough to be his mother, who belongs to a different generation. We are encouraged to re...

(1+6x)^3 = 1+3(6x) +(3)(2)(36x^2)/2 + (3)(2)(1)(216x^3)/6
= 1+18x+108x^2 + 216x^3