Beyond the answers - interesting background to this quiz

A presidency defined by war

Abraham Lincoln led the United States through the Civil War, which began in April 1861 after several southern states seceded. He issued the Emancipation Proclamation in 1863, declaring enslaved people in Confederate-held territory to be free, and was assassinated in April 1865, just days after the war effectively ended. His presidency is often studied as a case of political leadership under extreme pressure.

Lavoisier and the birth of modern chemistry

Antoine Lavoisier is known for the law of conservation of mass: in a closed system, matter is neither created nor destroyed in a chemical reaction. He helped show that combustion involves oxygen rather than a mysterious substance called phlogiston. His careful weighing experiments turned chemistry into a more quantitative science, though his life ended during the French Revolution.

Two capitals worth knowing

Sofia is the capital of Bulgaria, a country in southeastern Europe with a history stretching back to Roman times. Kampala is the capital of Uganda, a landlocked East African nation near the shores of Lake Victoria. Both cities are political and economic hubs for their countries, and both have grown rapidly in recent decades.

Why macaws don't live in the Sahara

The Sahara is the world's largest hot desert, spanning much of North Africa. Its wildlife includes species adapted to heat and drought, such as sand vipers and desert foxes. Macaws, by contrast, are parrots native to Central and South America, so they belong to tropical forests rather than desert sand.

Reading the periodic table

Dysprosium is a rare-earth metal with the symbol Dy, used in magnets and some electronics. Its name comes from a Greek word meaning "hard to get," reflecting how difficult it was to isolate. The periodic table's symbols can be tricky: not every one matches the English name, since many derive from Latin or Greek roots.