Why aren't all the TED Ed videos/animations captioned (or subtitled)?
I understand that TED has little control over content from YouTube, but it seems that adding captions and/or subtitles to the animations being created at the new lesson site would take little effort and add great value. As a teacher who works with deaf students, I'm very excited by the TED Ed endeavor. However, without captions, tens of thousands of students with hearing impairments* will be unable to take full advantage of this resource.
* In the USA 0.18% or 968,000 children aged 3-17 are considered hearing impaired; 0.1% or 52,000 are classified as Deaf.
Approximately 80 thousand students receive special education services due to their classification of being hearing impaired. http://nichcy.org/disability/specific/hearingloss