A double pendulum is a pendulum with another pendulum attached to its end, and is a simple physical system[?] that exhibits rich dynamic behavior[?]. The double pendulum is governed by very complicated formulas that can be found here (http://scienceworld.wolfram.com/physics/DoublePendulum). The double pendulum relates to:
... and Europe but not in the United States.
However, because the GBA has no region lockout, European games will work fine on a U.S. GBA unit, and apparently, even a player who ...