- Prokaryote | 17, 3k, 46
- Species | 0, 4k, 106
- Taxonomy | 12, 5k, 119
- Biology | 0, 10k, 468
- Natural science | 0, 61k, 2k
- Science | 0, 66k, 2k
- Ciro Santilli's Homepage | 262, 218k, 4k
- 100 Greatest Discoveries by the Discovery Channel (2004-2005) | 672
- Kingdom | 43
- Prokaryote | 17, 3k, 46