The Seasons :  the solar constant,  the ecliptic plane, obliquity, declination, solstice, equinox, eccentricity, perihelion, aphelion, precession of the equinoxes, vernal point...

Hydrogen is presented by some industrialists and managers as a potential pillar of the ecological transition, particularly in the context of transport (hydrogen-powered cars, hydrogen-powered

Il y a environ 4 milliards d'années, se développèrent dans l'eau terrestre des structures capables de se reproduire et d'évoluer. L'omniprésence de la cellule dans tous les systèmes vivants suggère un