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Submission + - Floating solar on lake Powell, save billions of gallons of water, generate GW? 1

An anonymous reader writes: In the commentary section of a Scientific American Article on the Navajo Coal Plant and the pollution it creates , "felicians" proposes that we cover Lake Powell with floating solar cells, thus saving up to 5 cities' worth of water per year from evaporation and generating GW of power while you are at it. There are of course downsides, but might this be worth doing?

Submission + - Extra dimensions? Only if smaller than 3*10^-6 m!

Vincenzo Romano writes: The website of the fortnightly scientific magazine Science News is reporting today an interesting article about the maximum size of any extra dimension, if any.
A team of theoretical physicists and astronomers has calculated that any hidden extra dimension beyond our familiar three-dimensional space, a world known in physics parlance as a 3-brane, must be less than 3 micrometers.
The study has been submitted online by Oleg Gnedin, Assistant Professor of Astronomy at the College of Literature, Science, and the Arts of the Univesrity of Michigan and is based on observations on one of the oldest black holes ever found in our universe, lurking deep inside the NGC 4472 galaxy.
Basically, that black hole has not evaporated yet by the Hawking radiation on the predicted "short" short timescale, thus posing an upper limit to the size of any extra dimensions to less thab 0.003 mm.
So what? String theorists must buy better magnifying lenses if they want to prove to be right.

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