A man uses the Bitcoin ATM in Hong Kong, Friday, May 11, 2018. Bitcoin is the world's most popular virtual currency. Such currencies are not tied to a bank or government and allow users to spend money anonymously. (AP Photo/Kin Cheung)
Bitcoin's fall from $19,000 late last December to $6,000 has not deterred investors. Kin Cheung / AP

Avoid the cryptocurrency 'rat poison' and exit while you can




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