It’s like this: You’re out in the yard, raking up the leaves that you didn’t get to last fall, piling ’em into the big yard-waste bin, and the 3½-year-old is wandering around pretending to help. Pretty soon the bin will be looking full while there are still lots of dead leaves that need to go in. Here’s what you do: You hoist the child up in the air and announce “You’re a squisher! Straight legs!” Then use the kid like a pile-driver to make room in the bin. Up-down up-down; the leaves compact amazingly and the child is squealing with glee. The only downside is that for the rest of the day, you’ll be hearing “Leaves need squishing again, Daddy?” approximately every 45 seconds.