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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)

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)


Svátky a výročí
24.03. Gabriel
25.03. Marián
26.03. Emanuel
27.03. Dita
28.03. Soňa, Den učitelů
29.03. Taťána
30.03. Arnošt

Citáty a aforismy
Dívá-li se některá žena často do zrcadla, není to ješitnost, ale statečnost.
Mark Twain

Obrázek dne