1. Introduction  
2. Preliminaries  
3. Helson meets Menchoff-Rademacher  
4. Helson meets Riemann  
5. Helson meets Carleson-Hunt  
6. Helson meets Bohr  
7. Helson meets Cesàro  
8. Helson meets Hardy-Riesz  
10. Helson meets Banach  