| 1. David's father served in the British Army’s Royal Engineers Corps during WWI. |
| 2. David developed an interest in mathematics at the age of four. |
| 3. During WWII, David and his sister were relocated to Devon in England. |
| 4. David did not attend school while living with his grandmother. |
| 5. His love for arithmetic calculations blossomed at the age of five. |
| 6. David was a top student in mathematics at his school. |
| 7. While studying at St Faith’s School in Cambridge, David earned a scholarship. |
| 8. He excelled academically at Winchester College. |
| 9. David's teachers critiqued his handwriting abilities. |
| 10. He submitted his doctoral thesis earlier than expected. |
| 11. David met his wife, Margaret Scrase, while studying in the US. |
| 12. He challenged and triumphed over David Bronstein in a chess match. |
| 13. The chess match against Bronstein took place at Trinity Hall Cambridge. |
| 14. David fell ill with a respiratory disease during his time at Churchill College, Cambridge. |
| 15. He was diagnosed with pneumonia in the winter of 1964. |
| 16. David participated in a scientific conference in Russia in 1965. |
| 17. He cherished the beautiful scenery of California where he lived. |
| 18. Conflict with Birmingham University led to David's resignation. |
| 19. He devoted his time and resources to conducting research in his laboratory. |
| 20. David served as the president of the Society for Psychical Research. |