If you've wondered about worm towers, and whether they'd actually work, take a look at this short little video I made of one of mine the other day. I check out what's happening inside the worm tower before I add the next load of coffee grounds and tea leaves into the tube.
You can also watch here how I made the worm tower.
And how my son devised an interesting way to harvest worms from standard worm farms without tipping out the materials - a useful thing to know when setting up a worm farm.