Here's a fact for you: If you bought $1 — yes, one single dollar — of Bitcoin in March, 2013, it would be worth $6 million today. Joyce Kim, who has been in the cryptocurrency game since the very beginning, joins us this week to explain what is really going on with all these digital currencies, why they are rising so rapidly, if you should own them (or if you already do, if you should sell them), if there's a Bitcoin Bubble, and why all the nerds in Silicon Valley can't stop talking about this digital gold.