KentuckyFC (1144503) writes “In June 1972, nuclear scientists at the Pierrelatte uranium enrichment plant in south-east France noticed a strange deficit in the amount of uranium-235 they were processing. That’s a serious problem in a uranium enrichment plant where every gram of fissionable material has to be carefully accounted for. The ensuing investigation found that the anomaly originated in the ore from the Oklo uranium mine in Gabon, which contained only 0.600% uranium-235 compared to 0.7202% for all other ore on the planet. It turned out that this ore was depleted because it had gone critical some 2 billion years earlier, creating a self-sustaining nuclear reaction that lasted for 300, 000 years and using up the missing uranium-235 in the process. Since then, scientists have studied this natural reactor to better understand how buried nuclear waste spreads through the environment and also to discover whether the laws of physics that govern nuclear reactions may have changed in the 1.5 billion years since the reactor switched off. Now a review of the science that has come out of Oklo shows how important this work has become but also reveals that there is limited potential to gather more data. After an initial flurry of interest in Oklo, mining continued and the natural reactors–surely among the most extraordinary natural phenomena on the planet– have all been mined out.” Read more of this story at Slashdot.
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Understanding the 2 Billion-Year-Old Natural Nuclear Reactor In W Africa
An anonymous reader writes “A former MIT instructor and students have come up with software that can write an entire essay in less than one second; just feed it up to three keywords.The essays, though grammatically correct and structurally sound, have no coherent meaning and have proved to be graded highly by automated essay-grading software. From The Chronicle of Higher Education article: ‘Critics of automated essay scoring are a small but lively band, and Mr. Perelman is perhaps the most theatrical. He has claimed to be able to guess, from across a room, the scores awarded to SAT essays, judging solely on the basis of length. (It’s a skill he happily demonstrated to a New York Times reporter in 2005.) In presentations, he likes to show how the Gettysburg Address would have scored poorly on the SAT writing test. (That test is graded by human readers, but Mr. Perelman says the rubric is so rigid, and time so short, that they may as well be robots.).'” Read more of this story at Slashdot. 
Boyers, Pennsylvania, is home to the Iron Mountain storage facility, a former limestone mine that is now the storage site of more than 15 million photographic negatives and prints, all preserved hundreds of feet underground. This documentary , produced by the Hillman Photography Initiative , takes you inside for a glimpse at the collection and the folks who maintain it. Read more… 
