I just read this article about the Gettier problem and found the concept pretty interesting. I have a few comments.
It might be true that even though I have a JTB about something I might be wrong. Nevertheless, I think It would be resonable to act upon a JTB as if it was true. For all practical purposes, it is true to the best of my knowledge. This does not mean I shun new information that might make me to change my JTB. And if having a JTB is not knowledge, what is? What can we know? We can always imagine a world where even our most firm JTB might be false.
If a JTB is not a good case to use the word knowledge I don’t know what is…