Circulatory_system
Computer
Global_Positioning_System
Endocrine_system
Respiratory_system
Optical_disc
Sistemang_nerbiosu
Sistemang_immune
Teoriang_chaos
Sistema_ning_pamamau
Matematica
Ingheniería
Pitagoras
Tim_Berners-Lee
Alvin_E._Roth
Marc_Garneau
Estruktúrang_sentru–periferia