Alex Santoso's Comments

Edward - it's actually done via radio signal. From :

Dallas' emergency warning sirens, like many across the country, are radio-controlled and activated via encoded transmitters that act like pagers, sending tones to receivers attached to each siren. In Dallas' case, security experts say, it appears that someone took control of the frequency and transmitted the tones that turned on all 156 sirens across the city.
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This reminds me of the "Salted Food Test," where Thomas Edison would take a job applicant to dinner. If that person salted their food without tasting it, Edison wouldn't hire that person because he obviously ignored the available data before jumping to conclusion.
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You underestimate the number of problems we have ;) But on a more serious note, I agree with you hearsetrax, these hackers should aim their energy and effort towards something more productive.
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I think that's common in the physical sciences - in my field of biochemistry, the norm was actually to pay for publication (the two journals that I got published in, Nature and Cell, require payments). Even open-access ones like PLoS charges publication fee (albeit only a fraction of the other journals). This is about ten years ago, so I don't know if it's still true.
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When I published my papers for my graduate degree ages ago, I was surprised when my professor showed me the bill. The journal (a reputable one) charged him thousands of dollars, which the university duly paid. It was standard practice and he didn't bat an eye.
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