Beyond the answers - interesting background to this quiz

A river that connects ten countries

The Danube is one of Europe’s most international rivers. It flows through or along the border of ten countries, including Germany, Austria, Hungary, Serbia and Romania, before emptying into the Black Sea. Its long history as a trade and transport route helped shape cities such as Vienna, Budapest and Belgrade.

Virginia Woolf’s daytime novel

Virginia Woolf is often associated with experimental works like Mrs Dalloway or To the Lighthouse, but Night and Day belongs to her earlier, more conventional period. Published in 1919, it explores love, class and women’s roles in Edwardian London. The title itself plays with contrasts between social convention and personal freedom.

Why Mars wears red

Mars owes its reddish appearance to iron oxide, commonly known as rust, covering much of its surface. The fine dust is rich in iron minerals that have oxidised over time. This dust is easily lifted by winds, sometimes creating planet-wide dust storms that give the planet an even stronger reddish glow.

The many names of a publishing phenomenon

The first Harry Potter volume appeared in the United Kingdom in 1997. In the United States it was published as Harry Potter and the Sorcerer’s Stone, a title change that has sparked decades of discussion among fans. The series went on to be translated into dozens of languages and remains one of the best-selling book series in history.

Silicon and the letter S

Silicon’s chemical symbol is Si, while S belongs to sulfur. This small distinction matters in chemistry, where symbols are often derived from Latin names. Silicon itself is a metalloid, widely used in electronics and glass production, and it is the second most abundant element in Earth’s crust after oxygen.