Thereās one thing in life that taught me more than anything elseāand it wasnāt some grand philosophy or life hack. It was raising my son Liam, from his first cries to his fourth birthday, mostly on my own. Thereās a whole education in that journey, one that life, books, or mentors canāt quite capture. I remember this one day when we were on vacation in Spain. Liam was at the playground, just this little guy, barely old enough to string together sentences. And yet there he was, running around ...