Back in 2013, my friend Sarah decided to invest a small sum in Bitcoin, more out of curiosity than conviction. At the time, a single Bitcoin was worth about $100. She bought 10 BTC for a total of $1,000 and promptly forgot about it. Fast forward to late 2017, Bitcoin's value skyrocketed to nearly $20,000 per coin. Sarah, who had been busy with her job and life, was astonished to find her $1,000 investment had grown to nearly $200,000. She used part of her newfound wealth to pay off her student loans and took a long-overdue vacation to Europe. Today, she stays up-to-date with the latest in cryptocurrency, always ready to tell her tale of unexpected fortune to anyone curious about digital currencies.