You see a whole lotta alternate realities. Sometimes, dey're as subtle as, I dunno, green stop signs instead of red.

[David stretches his neck, tilting it to the side for a moment.]

—Others, dey might share common history up to a point, den dey turn out really different. An' dat can lead to findin' worlds dat're lifeless wastelands, or—ones where humans never popped up at all.