The KEKB B-factory experimentally verified the Kobayashi-Maskawa theory, and contributed to their 2008 Nobel Prize in Physics. KEKB has realized various innovative technologies to achieve the highest luminosity in the world. KEKB has opened up a new frontier of high-luminosity colliders.

The B factory at KEK has been operated successfully with updating world record of the luminosity of electronpositron colliders, and has provided experimental test to the Kobayashi-Maskawa theory. First of all, large CP violation was discovered in B meson system, which is one of the predictions of the model, followed by its confirmation in various B meson decays. On the other hand, some phenomena have been found, which may not be fully explained by the model alone. It is strongly anticipated to clarify them by the upgraded B factory(ies).

CERN-LHC accelerator superconducting magnets and a cooperative work for interaction region quadrupole magnets are introduced. The accelerator commissioning and the incident happened during the commissioning in 2008 is also briefly discussed.