Beyond the answers - interesting background to this quiz

A narrow bridge between oceans and borders

Guatemala is one of the few countries that borders both Mexico and Honduras. It sits at the northern end of Central America, with coastlines on the Pacific Ocean and the Caribbean Sea. This position has made it a cultural and geographic bridge between North and South America, with Mayan heritage, volcanic landscapes and dense rainforests shaping its identity.

A mineral that resists more than scratches

Diamond is famous for its hardness, but that property is not just useful for jewellery. Because it is the hardest known natural substance, diamond is used in industrial cutting, drilling and grinding tools. Its hardness comes from the strong covalent bonds between carbon atoms arranged in a rigid crystal lattice. Despite this strength, diamond can still be broken with a sharp blow in the right direction.

An American in a foreign war

Robert Jordan, the central character in Ernest Hemingway's For Whom the Bell Tolls, is an American volunteer fighting against fascist forces in the Spanish Civil War. The novel is set in the mountains and follows Jordan as he prepares to blow up a bridge. Hemingway drew on his own experience as a war correspondent in Spain, and the book remains one of the most widely read works of American literature about that conflict.

The science of defence inside every living thing

Immunology is the branch of biology that studies the immune system, not only in humans but across all organisms. It examines how bodies recognise and respond to threats such as viruses, bacteria and parasites. The field has expanded far beyond medicine, helping researchers understand how plants resist disease, how insects fight infections, and how immunity evolved in different branches of life.

A night sky painted from memory

Vincent van Gogh painted The Starry Night in 1889 while he was a patient at the Saint-Paul-de-Mausole asylum in Saint-Rémy-de-Provence, France. The view is not a literal landscape but a combination of observation, memory and imagination. The swirling sky and bright celestial bodies have made it one of the most recognisable paintings in Western art, though van Gogh considered it a study rather than a finished masterpiece.