We have all changed someone’s life — usually without even realizing it. In this funny talk, Drew Dudley calls on all of us to celebrate leadership as the everyday act of improving each other’s lives.

Is there something you’ve always meant to do, wanted to do, but just … haven’t? Matt Cutts suggests: Try it for 30 days. This short, lighthearted talk offers a neat way to think about setting and achieving goals.

With help from some surprising footage, Derek Sivers explains how movements really get started. (Hint: it takes two.)

Have you ever felt like you’re talking, but nobody is listening? Here’s Julian Treasure to help. In this useful talk, the sound expert demonstrates the how-to’s of powerful speaking — from some handy vocal exercises to tips on how to speak with empathy. A talk that might help the world sound more beautiful.