(from the Foreword, titled "Walking Lessons") Walking lessons? You might think these are as unnecessary as eating or breathing lessons. Isn't walking a skill we learn around the age of one, pretty much master by two and then never forget.Not really. Children don't suddenly stand up and walk. Their first steps are lunging runs into the arms of waiting parents. They don't slow down much until their teenaged years, then soon get a driver's license and...