An activated wood door can still be closed by a player or villager and does not re-open until it receives a new activation signal (if a door has been closed "by hand", it still needs to be deactivated and then reactivated to open by redstone). Fuel...
use for the current block or item. In-game, this will be either the item you are holding, or the block you are looking at if your hand is empty or you are sneaking. If in a GUI, this will be the item directly under your cursor. Scroll your mouse wheel to cycle through the ...