Plauditecives

I realized, the moment I fell into the fissure, that the book would not be destroyed as I had planned. It continued falling into that starry expanse of which I had only a fleeting glimpse. I have tried to speculate where it might have landed, but I must admit, however— such conjecture is futile. Still, the question of whose hands might someday hold my Myst book are unsettling to me. I know that my apprehensions might never be allayed, and so I close, realizing that perhaps, the ending has not yet been written.

Très beau partage merci ! On pense toujours que Paris ne change plus trop depuis la première moitié du XXeme mais il y a tout un Paris industriel qui a disparu très tardivement et je trouve ça fascinant.

Et la pollution de l’air baisse aussi en dehors de Paris où il n’y a pas ces règles. Quelle est la part de réduction due aux normes des émissions des automobiles depuis 2007 vs à la limitation du trafic dans Paris ?

Telescopes with fixed optics and mobile mirrors have been done. Mostly used for solar observation but they are few exceptions.

Most notably This telescope from Paris’s 1900 universal Exhibit . Poor scientific instruments but great party trick with focal length of 57 METERS !