We must thank all the websites that we took such interesting information from.

1. http://en.wikipedia.org/wiki/Chain_e-mail
2. http://www.snopes.com/luck/chain.asp
3. http://www.google.com.hk
4. http://www.umich.edu/~policies/chain-mail.html
5. http://www.snopes.com/inboxer/medical/mydek.asp
6. http://www.google.com/patents?hl=zh-TW&lr=&vid=USPAT6823368&id=OkYSAAAAEBAJ&oi=fnd&dq=history+on+chain+e-mail
7. http://lighthousepatriotjournal.wordpress.com/2007/02/11/time-capsule-history-of-chain-mail/

...... And of course, all the chain e-mails we receive!