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In the dust, it lays down a layer of iridium, that can be known as the iridium layer, or the K-T boundary. And the layer is about 80 times more than anywhere else on the planet. It's very concentrated in asteroids, but very rare in the Earth's crust. And the K-T boundary, it's referred to the K-T boundary. K, the reason they use K-T was the original letter for the Cretaceous period. And the T, the tertiary period, it's now the Earth's face by the paleo-teen period. But that's where that came from, if you're wondering how they got iridium out of that and applied the K-T. So that's why they used that. Just hoping.