Remotely mathemetical subjects

Prime numbers, Eratosthenes

Checkdigit calculations

Great-circle navigation
Grotecirkelnavigatie

Amsterdam is a melodious city
Amsterdam is een melodieuze stad

How to tune a guitar - Calculations

Visual horizon
Visuele horizon

Degree calculations for Gooogle maps
Gradenberekeningen voor Gooogle-maps

Fibonacci

Gold: weight, value and size (Deutsch, Nederlands, Français,
Arabic: الذهب: وزن وقيمة وحجم ).

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10 plus 10 is 21