Because of poor acoustics, students in classrooms miss 50 percent of what their teachers say and patients in hospitals have trouble sleeping because they continually feel stressed. Julian Treasure sounds a call to action for designers to pay attention to the “invisible architecture” of sound.

In our louder and louder world, says sound expert Julian Treasure, "We are losing our listening." In this short, fascinating talk, Treasure shares five ways to re-tune your ears for conscious listening -- to other people and the world around you.

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.

Playing sound effects both pleasant and awful, Julian Treasure shows how sound affects us in four significant ways. Listen carefully for a shocking fact about noisy open-plan offices.

Julian Treasure says our increasingly noisy world is gnawing away at our mental health -- even costing lives. He lays out an 8-step plan to soften this sonic assault (starting with those cheap earbuds) and restore our relationship with sound.

Julian Treasure studies sound and advises businesses on how best to use it.

A thoughtful walk-through on what it takes to design spaces for quiet moments of reflection.

Is there a definitive line that divides crazy from sane? With a hair-raising delivery, Jon Ronson, author of The Psychopath Test, illuminates the gray areas between the two. (With live-mixed sound by Julian Treasure and animation by Evan Grant.)

Stressed about an upcoming presentation? These talks are full of helpful tips on how to get up in front of an audience and make a lasting impression.

Interviews can be intimidating. These talks are full of useful tips, tricks and advice that can help you land the job you’re after.

What do you do when your beliefs and understanding of the world have been challenged, unraveled or even destroyed? Take a deep breath and learn from TED's best on how to approach these moments with grace and fortitude.

Talks on the importance of listening, and how to do it much better.