And today we're going to talk about very large numbers, how to use them. And also an interesting article about outer space. Now, when we talk about numbers, I mean, large numbers, hundreds, thousands, millions, [billions] and trillions. Well, we usually use them in the singular. So we say a million, or 1 million, 2 million, two million five hundred thousand, several million. So we don't put the s on the end of these large numbers.