Matthew O'Reilly: "Am I dying?" The honest answer.

Cloudy climate change: How clouds affect Earth's temperature - Jasper Kirkby

Eman Mohammed: The courage to tell a hidden story

Kenneth Cukier: Big data is better data

How cosmic rays help us understand the universe - Veronica Bindi

Conversation Skills: DON'T BE SHY!

The state of the climate -- and what we might do about it | Nicholas Stern

Where do genes come from? - Carl Zimmer

Antonio Donato Nobre: The magic of the Amazon: A river that flows invisibly all around us

Avi Reichental: What’s next in 3D printing

The history of tattoos - Addison Anderson

Mac Barnett: Why a good book is a secret door

Andrew Connolly: What's the next window into our universe?

What is the Heisenberg Uncertainty Principle? - Chad Orzel

Particles and waves: The central mystery of quantum mechanics - Chad Orzel

What makes us get sick? Look upstream | Rishi Manchanda

Uldus Bakhtiozina: Wry photos that turn stereotypes upside down

How not to be ignorant about the world | Hans and Ola Rosling

The chemistry of cold packs - John Pollard

Dan Barasch: A park underneath the hustle and bustle of New York City

Making a TED-Ed Lesson: Bringing a pop-up book to life

I am the son of a terrorist. Here's how I chose peace | Zak Ebrahim

Why do we pass gas? - Purna Kashyap

Colin Grant: The son of a difficult father

Shubhendu Sharma: How to grow a tiny forest anywhere

Corruption, wealth, and beauty: The history of the Venetian gondola - Laura Morelli

Isabel Allende: How to live passionately—no matter your age | TED

Why we love repetition in music - Elizabeth Hellmuth Margulis

Why does the universe exist? | Jim Holt | TED

Jill Shargaa: Please, please, people. Let's put the 'awe' back in 'awesome'

Sally Kohn: Don’t like clickbait? Don’t click

What did dogs teach humans about diabetes? - Duncan C. Ferguson

Meera Vijayann: Find your voice against gender violence

Rose Goslinga: Crop insurance, an idea worth seeding

What happens when you remove the hippocampus? - Sam Kean

Martin Rees: Can we prevent the end of the world?

Feedback loops: How nature gets its rhythms - Anje-Margriet Neutel

Ziyah Gafić: Everyday objects, tragic histories

Depressed dogs, cats with OCD -- what animal madness means for us humans | Laurel Braitman

What can Schrödinger's cat teach us about quantum mechanics? - Josh Samani

Meeting and Greeting - simple phrases for English beginners

Jarrett J. Krosoczka: Why lunch ladies are heroes

Aziza Chaouni: How I brought a river, and my city, back to life

How do tornadoes form? - James Spann

Tim Berners-Lee: A Magna Carta for the web

The past, present, and future of the bubonic plague - Sharon N. DeWitte

The danger of silence | Clint Smith | TED

Eric Liu: Why ordinary people need to understand power