Jean Piaget

{1}{t} Add a development counter on target creature (For every development counter on
a creature, you can tap that creature for that much science)
———{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}
Piaget studied cognitive development and created a model with 4 stages: Sensorimotor, Preoperational, Concrete Operational, Formal Operational