Who wraps textbooks and why parents take over

In offices and bedrooms across China, a new kind of downtime has taken hold. People are hunched over trays of tiny plastic beads, arranging them one by one with tweezers. It is called Pindou, and it has become an unlikely escape from the noise of screens and notifications. / With everyone worried about the environment, why are we still covering our textbooks in plastic (15:17)? On the show: Steve, Fei Fei & Yushun