(22 Jun 2007)
Check this out…
http://www.xin.sg/article.php?category=87&article=5801
Although this is not a new invention (Saw it in some documentary that some people in india had done the same thing), it is still a good try.
The inventor hope that some manufacturer would take it up and put it into the market. But I doubt it can sell in Singapore. Not to mention that it cannot be patent.
Anyway, nice try !