| URL referals came from | Number of referals |
| http://chem.leeds.ac.uk/ | 4198 |
| http://www.exploratorium.edu/ | 2699 |
| http://www.anachem.umu.se/ | 1292 |
| http://www.yahooligans.com/ | 1441 |
| Direct | 1088 |
| Unreported | 472 |
| http://www.educationunlimited.co.uk/ | 160 |
| http://aolsearch.aol.com/ | 166 |
| http://www.madsci.org/ | 129 |
| http://kidscience.about.com/ | 71 |
| http://wwwnotes1.leeds.ac.uk/ | 70 |
| http://directory.google.com/ | 53 |
| http://www.dmoz.org/ | 47 |
| http://www.novatochemistry.com/ | 32 |
| http://www.belcho.be/ | 32 |
| http://directory.netscape.com/ | 23 |
| news://nntp.leeds.ac.uk/ | 20 |
| http://www.tagteacher.net/ | 19 |