Remember bitcoin? It's back. In a big way. Bitcoin prices have surged nearly 60% to about $6,000 after plunging almost 75% in 2018. Sure, the cryptocurrency is still far from its all-time highs of just under $20,000, which it hit in December 2017. But crypto investors are increasingly optimistic that the bitcoin (XBT) bounce of 2019 is real and that it and other cryptocurrencies may enjoy a steady march higher. It may be tempting to declare this year's bitcoin rebound as another sign of investor insanity. "Uh-oh: Investors are doing it again. Cue the sounds of a bubble being inflated. All we're waiting for now is ... (full story)