Sub-THz photons in the universe and in my life

Keep our eyes open. This could be my maxim, especially in 2015, international year of LIGHT. We have natural photons detectors. However, there are not simple spectrum detectors. Three orders of magnitude frequency below these visible photons are the THz and sub-THz photons, the main topics of this conference series. They played also a fundamental role all along my life, and recently for everybody when understanding the evolution of the Universe as a whole, or in the amazing single photon quantum games.