Beyond the answers - interesting background to this quiz

A word for every word against it

Antonyms are the mirror images of language: hot and cold, ancient and modern, expand and contract. English has absorbed opposites from Old English, Latin, Greek and French, which is why some pairs feel native (light and dark) while others sound borrowed (optimistic and pessimistic). Synonym, by contrast, describes a word with a similar meaning, and syllogism belongs to logic rather than vocabulary - a neat reminder that not every term ending in -onym is about naming.

The Mediterranean's crowded shoreline

The Mediterranean is bordered by 21 countries, spanning three continents. On the northern side sit Spain, France, Italy and Greece, among others; to the south lie Morocco, Algeria, Libya and Egypt; and along the eastern edge are Israel, Lebanon and Syria. It is one of the most heavily travelled and historically layered seas on Earth, which is exactly why so many nations share its coast.

Persia, Iran and the Tigris

Iran was known internationally as Persia until 1935, when the government asked foreign governments to use the name Iran - a word with older roots in the region's own languages. The Tigris, meanwhile, flows through Turkey, Iraq and, briefly, Syria, meeting the Euphrates in Iraq. Together they define Mesopotamia, the "land between the rivers" where some of the world's earliest cities appeared.

The pancreas and the discovery of insulin

The pancreas does double duty: it releases digestive enzymes and produces hormones, including insulin, which helps regulate blood sugar. In the early 1920s, Canadian researchers Frederick Banting and Charles Best worked on extracting insulin, a breakthrough that turned diabetes from a fatal diagnosis into a manageable condition. It remains one of the most consequential medical discoveries of the twentieth century.

Hydrogen, the simplest element

Hydrogen has atomic number 1, meaning a single proton in its nucleus. It is the lightest and most abundant element in the universe, forming the fuel of stars through nuclear fusion. On Earth it rarely appears alone, instead bonding with oxygen as water or with carbon in fuels - which is why hydrogen is central to many debates about clean energy today.