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

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

Shubhendu Sharma: How to grow a tiny forest anywhere

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

Why does the universe exist? | Jim Holt | TED

Meera Vijayann: Find your voice against gender violence

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

Ziyah Gafić: Everyday objects, tragic histories

The danger of silence | Clint Smith | TED

Beware, fellow plutocrats, the pitchforks are coming | Nick Hanauer

Talithia Williams: Own your body's data

Janet Iwasa: How animations can help scientists test a hypothesis

What light can teach us about the universe - Pete Edwards

How playing an instrument benefits your brain - Anita Collins

Ze Frank: Are you human?

Shih Chieh Huang: Sculptures that'd be at home at the bottom of the ocean

Nikolai Begg: A tool to fix one of the most dangerous moments in surgery

The many meanings of Michelangelo's Statue of David - James Earle

It's a church. It's a mosque. It's Hagia Sophia. - Kelly Wall

How do you explain consciousness? | David Chalmers

David Kwong: Two nerdy obsessions meet — and it's magic

What makes tattoos permanent? - Claudia Aguirre

Renata Salecl: Our unhealthy obsession with choice

A 30-year history of the future | Nicholas Negroponte

Inside the ant colony - Deborah M. Gordon

How heavy is air? - Dan Quinn

The time value of money - German Nande

Which country does the most good for the world? | Simon Anholt

Sara Lewis: The loves and lies of fireflies

What you might not know about the Declaration of Independence - Kenneth C. Davis

Chris Domas: The 1s and 0s behind cyber warfare

A guide to the energy of the Earth - Joshua M. Sneideman

How to Speak So That People Want to Listen | Julian Treasure | TED

How to speak monkey: The language of cotton-top tamarins - Anne Savage

Ge Wang: The DIY orchestra of the future

Naomi Oreskes: Why we should trust scientists

Lorrie Faith Cranor: What's wrong with your pa$$w0rd?

Attack of the killer algae - Eric Noel Muñoz

Shaka Senghor: Why your worst deeds don't define you | TED

What gives a dollar bill its value? - Doug Levinson

Billy Collins: Two poems about what dogs think (probably)

Jamila Lyiscott: 3 ways to speak English | TED

Why aren't we only using solar power? - Alexandros George Charalambides

How to make hard choices | Ruth Chang

Kwame Anthony Appiah: Is religion good or bad? (This is a trick question)

A brief history of religion in art - TED-Ed

Uri Alon: Why truly innovative science demands a leap into the unknown

Tycho Brahe, the scandalous astronomer - Dan Wenkel