I'm sorry for off-topic, I'm thinking about building an instructive web-site for college kids. Will possibly start with publishing interesting information such as"The glue on Israeli postage is certified kosher."Please let me know if  you know where I can find some related information such as here
 
http://www.clusterclue.in/there-is-no-will-need-to-talk-about-the-value-of-8/