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zero618e's picture

Word Play with Mathematica

Here in Champaign-Urbana, where Roger Ebert was raised, I took notice when Disney announced the end of its long relationship with Ebert & Roeper. Disney also announced the replacement critics, Lyons & Mankiewicz. Was there something intentional in that?

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Fred Bortz's picture

Watch this space for full book reviews

I tagged this with every category since I review books in all realms of science.

Though I plan to maintain my Science Shelf archive of book reviews, I will now also publish the reviews on Science Blog.

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Computer models to provide military with better intelligence

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Adversaries the U.S. currently faces in Iraq rely on surprise and apparent randomness to compensate for their lack of organization, technology and firepower. If one could find some method to their madness, however, the asymmetric threat could be made significantly less serious, according to scientists at The University of Alabama in Huntsville.

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Fred Bortz's picture

Encourage your candidate to participate in ScienceDebate2008

Now that the primaries have narrowed the number of viable major-party presidential candidates to three, ScienceDebate2008 promises to give each of them an opportunity to address an issue that is not strictly partisan: science and technology policy and what it means for the future of our nation and the world.

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How to prove the theorem of Gaussian adaptation

Because the Gaussian distribution is the exponential of squared parameters, the proof of its theorem for adaptation is a rather simple matter, which should be understandable at the high school level. Because the theorem is valid for all Gaussians and all regions of acceptability (even probability functions) it is in principle sufficient to see the proof for a Gaussian with variance = 1 in a single parameter. The proof is easily extended to an arbitrary number of parameters.

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Morgellons is a "bad" reaction

Does Michael Crichton wear a tin hat?

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Is Morgellons Grey Goo? See Proof

Will Kaiser/CDC admit we are infected with this? How will they react in the litterbox?

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Morgellons Makes Front Page!

CDC produces Media Alert - Morgellons

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Information theory is the basis of Gaussian adaptation

According to Kjellström, 1969, (see reference in the list
http://en.wikipedia.org/wiki/Gaussian_adaptation#References)
a connection between GA and information theory is the average speed of stepwise random walks inside a high dimensional simplex region. It turns out that the speed is asymptotically proportional to (see also the point 7 in blog “Gaussian adaptation as a model of evolution”)
- P log(P),
where P is the probability that a random step will lead to a new feasible position inside the simplex. Maximum speed is obtained when P = 1/e = 0.37.

A plausible interpretation of this is that 1/P is proportional to the time/work needed to find a step leading to a feasible position, while –log(P) is the self-information obtained when such a step may be taken. Thus, – P log(P) may be seen as a measure of efficiency; information divided by the work/time needed to get the information. In addition GA maximizes the average information of a Gaussian distribution

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Fred Bortz's picture

Science Debate 2008 movement picks up key leaders

Science Debate 2008 is a nonpartisan effort to promote a public discussion of science and technology policy in the coming U.S. Presidential election.

Supported by numerous university presidents, Nobel Laureates, and other scientific leaders, the effort appears to have reached viability with the announcement of its co-chairs, two congressmen from different political parties.

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