Mountain lions in the Santa Monica Mountains are killing each other and inbreeding at alarming rates.
The problem isn't geography, demographics, or money—it's federal will.
The state is as likely a place as any to see the future of rail unfold.
Here are a few ways to make sure they don't.
These fearlessly biased maps point out areas of "religious wackadoodles," "white guilt," and "Kardashian watchers."
The story of Boyle Heights reminds us that urban highway teardowns don't always end in victory.
In fact, head injuries declined about 14 percent after cities started bike-sharing programs.
Two maps and six charts take sprawl rankings to another level.
Cities are experimenting with different materials — from heated panels to flexible rubber — but the best replacement has yet to emerge.
Despite its reputation, L.A. has deep walkable roots.
Catching up with the man fascinated by the relationship between humans and their personal vehicles.
But they're not alone: roughly half the nation lives with unhealthy concentrations of ozone or particulate pollution.
A lesson in range anxiety on the country's emerging Supercharger network.
The People St program helps novices create a parklet, plaza, or bike parking area.
New York and L.A. are losing more Americans than they're gaining, but the flood of immigrants more than makes up for it.
Transportation network companies mirror early 20th century jitneys — except this time they'll survive.
Some of Garry Winogrand's most compelling images of New York, L.A., and Albuquerque.
Old photographs from the infamous police department will be on display inside a fake police station at Paramount Studios.
Mapping where homes are out of reach for the median family.