Blueshade

Wikipedia:Babel

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Just a shade of blue. Probably from somewhere around 460 nm but that has not been entirely confirmed.

more info can be found at this nice, though a trifle outdated site.

Photos contributed to these articles:

• Wolfsschanze
• Royal Dutch/Shell
• Regent's Park
• Filter (photography)
• Aswan Dam
• Elephantine
• Kitchener's Island
• Felucca

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some other, interesting wikipedia stuff:

• Tether propulsion