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In extreme cases, sonic weapons can cause nausea, dizziness, and even permanent damage. In this case, officials used it to ...

Use of a “sonic weapon” might sound like something out of a science fiction novel, but experts confirm similar technology ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Government stimulus aims to boost the ...

Elvis Picardo is a regular contributor to Investopedia and has 25+ years of experience as a portfolio manager with diverse capital markets experience. Robert Kelly is managing director of XTS Energy ...