- Human nervous system | 0, 0, 1
- Human body | 9, 9, 2
- Human | 14, 89, 7
- Animal | 11, 133, 10
- Eukarya | 9, 598, 16
- Species | 0, 946, 26
- Taxonomy | 12, 1k, 37
- Biology | 0, 4k, 218
- Natural science | 0, 49k, 1k
- Science | 0, 53k, 1k
- Ciro Santilli's Homepage | 262, 182k, 3k