The Cosmological Constant and the Multiverse

The cosmological constant itself is the one energy density in the universe that does not dilute. And a cosmological Constant expands the universe much faster than other types of matter. So we have to live in a place where exponential expansion didn't take over before stuff was formed. We could have seen zero or never detected it, and we'd say, oh, there's some magical reason why thecosmological constant is zero.