1985’s Technic Go-Kart (set #1972) contained 98 pieces and seemed manageable. He wanted to create something his 8yo nephew [Ruben] could sit in, but had to rule out a fully kid-sized go-kart.

Quarter-life crises are on the rise, and those who can are spoiling their inner child with adult-sized Heelys and electric Mario Karts that can ... motor like that and go — you need a battery ...