Beyond the answers - interesting background to this quiz

Why pure metals rarely make the cut

Sterling silver is an alloy, which means it is a mixture of silver with another metal, usually copper. Pure silver is quite soft, so adding a small amount of copper makes it harder and more durable for cutlery, jewellery and coins. The same logic applies to many everyday metals: steel is iron mixed with carbon, and bronze is copper mixed with tin.

The liver's quiet chemical factory

The liver produces bile, a fluid that helps the body break down fats during digestion. It is stored in the gallbladder and released into the small intestine when needed. Beyond bile, the liver also processes nutrients, filters toxins from the blood and stores energy in the form of glycogen, which makes it one of the busiest organs in the body.

The aorta and the body's biggest delivery route

The aorta is the main artery leaving the heart, carrying oxygen-rich blood to the rest of the body. It arches upward before running down through the chest and abdomen, branching into smaller arteries along the way. The coronary arteries, by contrast, are the vessels that supply the heart muscle itself with blood.

A capital question with a twist

Dublin and Doha are both capital cities, serving Ireland and Qatar respectively. Denpasar is not a national capital; it is the capital of the Indonesian province of Bali. Indonesia's actual capital is Jakarta, though the country has been planning a move to a new city, Nusantara, on Borneo.

Mariachi music and its Mexican roots

Mariachi bands originated in Mexico, most strongly associated with the western state of Jalisco. A traditional group blends trumpets, violins and guitars, including the large guitarrón, and often performs in matching charro suits. The style is recognised by UNESCO as part of Mexico's intangible cultural heritage.