- Human nervous system | 0, 0, 1
- Human body | 9, 9, 2
- Human | 12, 87, 7
- Animal | 11, 127, 10
- Eukarya | 9, 576, 16
- Species | 0, 882, 26
- Taxonomy | 12, 1k, 37
- Biology | 0, 4k, 187
- Natural science | 0, 30k, 686
- Science | 0, 36k, 821
- Ciro Santilli's Homepage | 238, 147k, 2k