| PIAGET | Psychologist Jean known for his theory of cognitive development |
| DARWIN | Charles _, naturalist known for his theory of evolution (6) |
| CHARLESDARWIN | British scientist known for his theory of evolution: 2 wds. |
| EMPEDOCLES | Greek philosopher known for his theory of four elements (10) |
| EINSTEIN | Which scientist is known for his theory of relativity? (8) |
| ALBERT | Physicist famous for his Theory of Relativity (6,8) |
| COPERNICUS | Polish astronomer best known for his theory that the sun is at the centre of the universe (10) |
| IAGET | Cognitive development psychologist Jean |
| APPLE | Associated with the legends of Avalon and of William Tell, fruit said to have further prompted Isaac Newton in his theory of gravity (5) |
| EVOLUTION | From the Latin meaning "unrolling", a process described by Charles Darwin in his theory of natural selection; or, one of a series of military manoeuvres (9) |
| EKMAN | Swedish oceanographer noted for his theory explaining the importance of the Coriolis force on ocean currents (5) |
| GALAPAGOS | Group of islands in the Pacific whose unique fauna led Darwin to formulate his theory of evolution (9) |
| ALFRED | _ Bussel Wallace formulated his theory of evolution by natural selection independently of, and before publication by, Darwin (6) |
| GEMMULE | Hereditary particle Darwin postulated in his theory of pangenesis (7) |
| BRECHT | His theory of alienation was dramatically expressed (6) |
| MALTHUS | Thomas, English demographer born in 1766 noted for his theory on population growth (7) |
| ISAAC | English polymath who formulated his theory of gravity whilst watching apples fall, _ Newton (5) |
| BEAGLE | HMS _, ship on whose second voyage Charles Darwin developed his theory of evolution (6) |
| HALOEFFECT | Psychological term for a type of cognitive bias |
| PTSD | Focus of cognitive processing therapy, for short |
