DARPA在80年代开发了SIMNET，意在实现虚拟兵棋推演，由此启发了《魔兽世界》诞生。DARPA和CIA在《魔兽世界》中秘密追踪和研究玩家的行为，这一计划后来被斯诺登曝光。

All study and no play can lead to low fitness levels and poor eyesight, with statistics showing that one in every two Chinese children and adolescents is near-sighted, and one in every five students ...