The Download: turning down human noise, and LA’s stunning subway upgrade

The Download: turning down human noise, and LA’s stunning subway upgrade Plus: Apple’s Tim Cook is stepping down as CEO. This is today's edition of The Download, our weekday newsletter that provides a daily dose of what's going on in the world of technology. The noise we make is hurting animals. Can we learn to shut up? As human society has expanded, animals have started struggling to hear one another. For many birds, the noise has grown so loud that they’ve begun to sing with faster trills. Now, their mating calls aren’t as effective. The growing hubbub can also increase bird-on-bird conflict, and entire species that can’t handle urban clamor simply leave town for good. But there are technological solutions to the noises hurting animals—and they could help humans, too. —Clive Thompson Los Angeles is finally going underground In May,…