- da Gama, Vasco 17
- Damascus 16
16 Great Mosque of -
- dark ages
8 in ancient Greece
13 in medieval Europe
- Darwin, Charles 25 30 31 34 35
25 on evolution
- Darwin, George 31
- Davy 35
- day
7 sidereal -
7 solar -
- da Vinci, Leonardo 17
- DDT 35
- De arte venandi cum avibus13
- De humani corporis fabrica libri septem 19
- decolonization 35
- Delambre 21
- Delhi 21
- Delhi sultanate
14 foundation of -
- democracy
8 in ancient Greece
- Democritus 24
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- Descartes 19 30 33 34
- dhow 16
- Dialogue on the Two Main World Systems 19
- Dictionnaire des termes d'usage en botanique 25
- Diderot 22 23
- difference engine 32
- dinosaurs 25 31
- Diocles 9
- Diocletianus 12
- Diophantus 11
- Dioscorides 11
- dissection
9 in Alexandria
9 in Greece
9 restrictions on -
19 use by Vesalius
- DNA 25 34 35
- double helix (DNA) 34
- dodo 19
- Dresden codex 7 18
- Drosophila melanogaster 34
- du Toit 31
- dynamics 20
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