According to the WHO, 5% of the world’s population – about 360 million people – are deaf or hearing-impaired. That’s a huge audience that isn’t being served if your videos aren’t captioned. There are also, obviously, lots of skeptics who don’t speak English but who would love the material as well.
To better serve these segments of the skeptical community, a few groups have started projects to subtitle skeptical and scientific videos, through services like Amara.org. Tim Farley, over at the Skeptools blog, has written up a post summarizing a few of the efforts that are ongoing. If you think you might be able to help out, even with just a video or two, surf on over and check it out. Find something you’re interested in and get captioning!