Common Craft provides "explanation"
On this website, they explain some complex subjects in plain English so that we can easily understand what they actually are. I watched the video about "Podcast" last week. Although I had already known what Podcast was, I really enjoyed listening to the explanation.
Through those videos, not only we get to understand certain stuff, but we can also learn the techniques of explanation. There are so many tips for a good presentation. It would be a good practice to imitate those videos in order to be better at explaining something to people.
We can find topics in which we're interested by browsing on the website. We can also see videos in other four languages; French, German, Portuguese and Spanish.
Common Craft http://www.commoncraft.com/