You have JavaScript disabled
For the best experience, please turn JavaScript on.
Here's how
Menu
Main menu
TED
Watch
TED Talks
Browse the library of TED talks and speakers
TED Recommends
Get TED Talks picked just for you
Playlists
100+ collections of TED Talks, for curious minds
TED Series
Go deeper into fascinating topics with original video series from TED.
TED-Ed videos
Watch, share and create lessons with TED-Ed
TEDx Talks
Talks from independently organized local events
Discover
Topics
Explore TED offerings by topic
Podcasts
TED's original podcast initiatives
TED Books
Short books to feed your craving for ideas
Ideas Blog
Our daily coverage of the world of ideas
Newsletter
Inspiration delivered straight to your inbox
Attend
Conferences
Take part in our events: TED, TEDGlobal and more
TEDx events
Find and attend local, independently organized events
TED on screen
Experience TED from home
Participate
Nominate
Recommend speakers, Audacious Projects, Fellows and more
Organize a local TEDx event
Rules and resources to help you plan a local TEDx event
Translate
Bring TED to the non-English speaking world
TED Fellows
Join or support innovators from around the globe
About
Our organization
Our mission, history, team, and more
Conferences
TED Conferences, past, present, and future
Programs & Initiatives
Details about TED's world-changing initiatives
Partner with TED
Learn how you can partner with us
TED Blog
Updates from TED and highlights from our global community
TED Guide to Public Speaking
An insider’s guide to creating talks that are unforgettable
Membership
Sign in
Search
Search:
Cancel search
David Castain
1,051,262
views
• 7:27