So
what's the story on these peppers that are setting the world on fire?
There are hundreds of varieties from all over the world and all share
one basic trait in common which is the impression of "heat"
when we consume them. The main ingredient responsible for the
"sting" is called Capsaicin which is the
most powerful member of the group of compounds called "capsaicinoids".
For the scientifically curious there are some great pages on the web
that can give you tons of details on the chemical behavior of these
compounds as well as insight into medical uses and how our sensation of
taste actually works...
http://chileheads.netimages.com/
http://www.chilipepper.de/
http://firegirl.com/
http://www.chileplants.com/
http://easyweb.easynet.co.uk/~gcaselton/chile/chile.html