What is it about the Terra Cotta pots that make this work so well? Why couldn't you use other kinds of pots? Also, why sand and not rocks or dirt? What is the scientific basis for this working?
I mean, it's really cool and all, but what if you don't have all the pieces necessary to make this exactly this way? Would it still work using other things that are at least somewhat similar. I don't have all these items, but I have some of them, and I can't afford to go buy them either. So would other items work?
I guess if these are the best items to use, I'll just have to save up some money to try it. Hey, if it can save me money living in a small apartment, maybe I can have a bunch of them, eventually, and really start to save money on my electricity bill. It'll be interesting to see. God knows I could sure stand to save money.