 But we have got an estimate, based on each species lasting 5 million years and then evolving into two new ones. That gives us 2 to the power of 50, or 1 quadrillion, 125 trillion, 899 billion, 900 million. You know what? I think I can hear that buzzing again. Let's take another break and look at a different fly-related question from a listener. My name is Colin and I'm actually in Barbados.