A mock oil pipeline near Cushing, Okla.
A mock oil pipeline near Cushing, Okla. Brent Baughman/NPR
In this week's podcast of weekends on All Things Considered, a look at the Keystone pipeline controversy. Also, the ghosts who walk the halls of the state department, the life of former Italian prime minister Silvio Berlusconi and jazz master Robert Glasper. Plus, a surprise music cameo.