Leonard da Vinci’s  ability to stand at the crossroads of the humanities and the sciences,  made him history’s most creative genius.  In this new biography, Walter Isaacson (Einstein, Steve Jobs) probes the roots of his genius.   Focusing on Leonardo’s notebooks, author Isaacson finds a relentless curiosity and capacity for careful observation that united Leonardo’s artistic and scientific pursuits.  A  misfit in many ways (illegitimate, gay, vegetarian, left-handed, easily distracted, heretical), “his life should remind us of the importance  not just of received knowledge but a willingness to question it” (Goodreads).