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Technology doesn’t make everyone happy. Just ask computer scientist Bill Joy, who has pioneered everything from operating systems to networking software. These days the Silicon Valley guru is best known for preaching about the perils of technology with a gloom that belies his name. Joy’s message is simple: limit access to information and technologies that could put unprecedented power into the hands of malign individuals (what is sometimes called asymmetric warfare). He is also translating that message into action: earlier this year, his venture-capital firm announced a $200 million initiative to fund projects in biodefence and preparation for pandemics. …