ELI5 Airport Security - why we have a 100ml fluid limit?

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Why do we have a limit on the amount of hand carry liquids when we travel, and how is the fluid limit in airports an effective security measure? How was the TSA formed? Are those full body scanners at airports safe?
 
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ELI5 Airport Security - why we have a 100ml fluid limit?

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ELI5 Airport Security - why we have a 100ml fluid limit?
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