A second serve: how used tennis balls come back to life

What if the thing you toss without thinking outlasts you by four centuries? That is the tennis-ball problem. Millions of them, every year, destined for centuries in a landfill. But in Qingdao, they have found a fix. The solution came from 20,000 dead balls reborn as a court you can actually play on. This is the story of waste that won't wait 400 years to disappear. / A viral complaint is sweeping across China right now. Professors and employers are frustrated because their students and young hires cannot write a proper email. Subject lines are missing. Greetings are absent. Sign-offs are nowhere to be found. But these kids grew up on messaging apps, where speed always won and formality never mattered. So who is really out of touch here? Them, or the rest of us? (27:46) On the show: Steve, Yushan & Yushun