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The I Index

Hamilton Cain,
The Wall Street Journal
... clear-eyed, crisply written.
Stella O'Malley,
The Evening Standard (UK)
The impact that testosterone has on our bodies, from our sexual urges to our behaviour, is outlined so clearly and memorably in this book that nobody reading it could continue to dismiss nature’s influence.
Tony Miksanek,
Booklist
Hooven, a biological anthropologist at Harvard, deftly details the tremendous impact of testosterone ('T') on 'our bodies, brains, and behavior in the service of reproduction'.
Cate Triola,
Library Journal
... a thorough and interesting assessment of the science behind testosterone and human behavior.

Publishers Weekly
... comprehensive.

Kirkus
... timely and intriguing yet eminently debatable territory.