When Cal hears how Bitcoin is becoming a huge part of the economy in Nigeria, he remembers a conversation he had with Cameron and Tyler Winklevoss about the cryptocurrency in 2013. Back then, a Bitcoin valued $140. Now, it's at about $33,000. And that's after a steep decline from earlier this year, when it got up to about $60,000. The way the twins spoke about Bitcoin is a huge reminder to Cal to pay attention to the new developments in healthcare. And this conversation is a reminder to all of us to pay attention to the future before it happens.