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</html><thumbnail_url>https://www.gt-engineering.it/wp-content/uploads/2023/06/312691-2-768x480-1.jpg</thumbnail_url><thumbnail_width>768</thumbnail_width><thumbnail_height>480</thumbnail_height><description>En 1752, l'inventeur am&#xE9;ricain Benjamin Franklin a d&#xE9;couvert, lors d'une exp&#xE9;rience tr&#xE8;s dangereuse avec un cerf-volant, que la foudre contient de l'&#xE9;lectricit&#xE9;. Aujourd'hui, nous savons que la foudre peut se d&#xE9;charger entre un nuage et le sol (foudre au sol, foudre descendante), entre le sol et un nuage (foudre ascendante) ou entre un nuage et un autre nuage. La plupart des d&#xE9;charges atmosph&#xE9;riques d&#xE9;tect&#xE9;es sont des "&#xE9;clairs descendants n&#xE9;gatifs" : ce type de d&#xE9;charge est ca</description></oembed>
