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    I cant walk without having a sharp lower back pain?

    I'm 16 years old and for 3 days I've tried to walk but I can't because I have a sharp lower back pain and it makes me cry because I'm in so much pain. I have scoliosis but its mild so I don't think it has to do with that, but I need to know what I can do and do to take this pain away. I don't...
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    Wind turbine efficiency?

    Wind turbines have an efficiency between 40 and 55%. Where does the missing energy go? I don't know what to do for this question. What type of waste energy is produced by a wind turbine?
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