When you measure pizza in dollars, it gets more expensive over time. TWO PIZZAS IN 2010: $41.12 TWO PIZZAS TODAY: $51.92 When you measure pizza in #bitcoin, it gets cheaper over time. TWO PIZZAS IN 2010: 10,000 BTC TWO PIZZAS TODAY: .0019 BTC Tasty. Happy #BitcoinPizzaDay.