learner. this really appeals to me. let's get right to it. you are going to explain in 30 seconds these concepts for some people are very difficult. let's put a timer on. and we're going to go. so let's start with bit coin. >> so bit coin is digital money. exchange peer-to-peer. the advantages are that it includes no fees. it's anonymous. you don't need a bank account. it's decentralized. there is a global reach. of course it's volatile. and it's stored in a digital wallet. bit coin is also exchanged either peer-to-peer. can you receive it or you can mine it. it was discovered by and created by identity unknown. rachel: 3, 2, 1: let's go to the stock market. >> stock market is a collection of physical and electronic exchanges where buyers and sellers come together to trade stocks. stock exchanges make up the stock market.