Okay, let’s say the bilingual journey lasts from birth to age 18—that’s 18 years, or 6570 days. (After that, our children are on their own and we can adjourn to our hammocks.) Now, if each day can be considered one step, that equals 6570 steps for the whole journey. But there’s a catch, too. These steps don’t usually head off into the horizon over flat land. No, for most who travel this way, these 6570 steps go up, up, up