Home on the range

The ‘t’ key on my macbook air has begun to stick. What might this be? How can I fix it? I can extract a ‘t’ out of the keyboard if I concentrate, but the key isn’t nearly as responsive as the other ones. Is there some cheap and easy fix for this.

(Am writing this right now on one of those bluetooth keyboards. Oherwise every senence would look like his one. Curses! If only it was the ‘x’ or ‘z’ keys, I could ignore this problem indefinitely.)