Garden Tools

My brother is always coming up with these ideas. Sometimes they're a little wild, like when he tried to make snow in the winter by using a big fan and cold water. Other times, like what he showed us today, his ideas are awesome!
Today he showed us a place in the yard where he set up a little garden type looking area (photo included). He ordered some red worms online and put a bunch of them in this little area. The red worms take the grass he cuts and they eat it, which in turn, creates fertilizer (I'm guessing when they poop it out?).
For more information you can look them up as Eisenia fetida on Wiki. Or just Google red worm and you can find a bunch of information.
He was also talking about how fast they reproduce and I'm hoping they stay in the area they're suppose to.