Beyond the answers - interesting background to this quiz

When Clocks Melt: Dalí's Surrealist Masterpiece

Salvador Dalí painted "The Persistence of Memory" in 1931, and its image of melting pocket watches has become one of the most recognisable works of surrealism. The small canvas, now held at the Museum of Modern Art in New York, plays with the idea of time losing its fixed, rigid quality. Dalí claimed the soft watches were inspired by a wheel of Camembert cheese he saw melting in the sun.

The Sea That Borders Six Nations

Six countries share a coastline with the Black Sea: Bulgaria, Romania, Turkey, Georgia, Russia, and Ukraine. Because so many rivers drain into it and it connects to the wider ocean only through narrow straits, the Black Sea is one of the largest bodies of water with very low salinity. Its deeper layers are also famously low in oxygen, which has shaped the marine life found there.

Oxygen: The Hidden Giant of the Crust

Oxygen is the most abundant element in the Earth's crust by mass, even though we usually think of it as a gas in the air. In the crust it is locked inside rocks and minerals, most often combined with silicon in compounds such as quartz. Silicon comes second, which is why the two together make up the bulk of the ground beneath our feet.

Two Rivers, Two Countries, One Shared Name

The Ganges flows across northern India and into Bangladesh before emptying into the Bay of Bengal, making it one of South Asia's most important waterways. New Delhi, the capital of India, sits far from the river's main course, on the Yamuna. Both rivers carry deep cultural and religious significance for millions of people across the region.