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Comment Re:So will he go to jail upon return to the US? (Score 5, Insightful) 190

The ban has nothing to do with 'Cold War tensions' it is because Cuban immigrants to Florida hate Castro for the property that he nationalized - and pissing off those voters risk losing Florida in federal elections (and thus losing the Presidential election). Thus draconian prohibitions related to Cuba stay in place.

Comment Re:No, they're replacing. (Score 3, Informative) 341

"There is not a fixed number of jobs in an economy."

There is demand elasticity for labor, but it is not related to availability of labor it is related to demand for goods and services, not availability of labor. The demand for labor is essentially fixed or decreasing without some sort of driver for demand. Immigration can be a source of demand, but it isn't necessarily a source of demand. Since most immigrants send much of their income to their home country they tend to be a net reduction in demand.

The reason unemployment is correlated to immigration is that countries relax immigration requirements when there is a shortage of labor.

Space

Mysterious X-ray Signal Hints At Dark Matter 100

Astronomers using the Chandra X-ray Observatory and the XMM-Newton have recorded an unusual emission of X-ray light from a remote cluster of galaxies which may turn out to be evidence of dark matter. Astronomers think dark matter constitutes 85% of the matter in the Universe, but does not emit or absorb light like “normal” matter such as protons, neutrons and electrons that make up the familiar elements observed in planets, stars, and galaxies. Because of this, scientists must use indirect methods to search for clues about dark matter. he latest results from Chandra and XMM-Newton consist of an unidentified X-ray emission line, that is, a spike of intensity at a very specific wavelength of X-ray light. Astronomers detected this emission line in the Perseus galaxy cluster using both Chandra and XMM-Newton. They also found the line in a combined study of 73 other galaxy clusters with XMM-Newton. ... The authors suggest this emission line could be a signature from the decay of a "sterile neutrino." (Abstract.) Sterile neutrinos are a hypothetical type of neutrino that is predicted to interact with normal matter only via gravity. Some scientists have proposed that sterile neutrinos may at least partially explain dark matter.

Comment Re:Bad analogy (Score 1) 185

Look at ipython notebook,

it is a lot like the workflow for mathematica or R.

Look at pandas + scipy stack.

pandas replicates the functionality of R dataframes but integrates many features found in external R packages in a beatiful and intuitive way.

notebook + scipy stack (scipy, numpy, sklearn, matplotlib w seaborn or use ggplot if you prefer) + pandas is enough to largely eliminate the need for R for most people doing machine learning or statistical.analysis (there are still occassional times when I need something from R but it is rare).

Comment To generate the keywords takes knowledge (Score 1) 187

Since the essays are grading subject knowledge, and it takes subject knowledge to provide the keywords, it is fairly irrelevant if the essay happens to be structured in a manner that is nonsensical.

Demonstration of deeper understanding, if it needs to be tested, can be achieved via other types of questions.

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