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Věda a technika

Wolfram|Alpha - computational knowledge engine
Wolfram|Alpha gives you access to the world's facts and data and calculates answers across a range of topics, including science, nutrition, history, geography, engineering, mathematics, linguistics, sports, finance, music, etc. (en)
Go beyond text with image and dataset input, file upload. Special character keyboards. Interact, customize, download and save results. (en)

NASA
National Aeronautics and Space Administration. (en)
The most comprehensive compilation of NASA stills, film and video. (en)

NASA Earth observatory
The Earth observatory's mission is to share with the public the images, stories, and discoveries about the environment, Earth systems, and climate that emerge from NASA research, including its satellite missions, in-the-field research, and models. (en)

Počasí

Svátky a výročí
05.02. Dobromila
06.02. Vanda
07.02. Veronika
08.02. Milada
09.02. Apolena
10.02. Mojmír
11.02. Božena

Citáty a aforismy
Přístroj, který je pod proudem, vypadá stejně jako ten, který není, jen je jiný na dotek.
 

Obrázek dne