Dedication

To my father, Eddie (r.i.p), who inspired my interest in computers in the mid-80s and passed on his dream of going to MIT.
To my mother, Chichi, who instilled in me the value and joy of reading.
To my wife, Liliana (akaa.k.a Lilo), who gives meaning to everything I do (always) and takes pride in my achievements (almost always).
To Domingo, Teresa, and Francisco, who are our greatest challenge and our happiest adventure.
To my uncle, Jorge A. Rizzi, who invited me to work at SADOI, where I learnedfell toin programlove with LOGO .and simulations.
To Jorge A. Rey Valzacchi, a pioneer in integrating technology into education in Argentina.
To Rosa Kaufman, a trailblazer of LOGO in education in Argentina.
To my friends, who never quite understood what I do for a living, but appreciate it all the same.