Beyond the answers - interesting background to this quiz

San Diego is big, but not a capital

San Diego is the second-most populous city in California and sits directly on the border with Mexico. Sarajevo and Seoul, by contrast, are national capitals - of Bosnia and Herzegovina and South Korea respectively. Capitals are not always the largest cities in a country, which is exactly what makes questions like this one a reliable trap in geography quizzes.

The vehicle code that confuses Americans

The international vehicle registration code for the United States is USA, not US. These codes date back to a 1909 international convention and are still used on cars crossing borders. Many people assume the code matches the country's two-letter internet domain, but vehicle registration follows its own older system.

Mitochondria and the origin of a slogan

Mitochondria are often called the powerhouse of the cell because they produce ATP, the molecule that carries energy for most cellular processes. The phrase became a school biology staple, repeated so often that it has turned into a mild internet meme. Mitochondria also contain their own small amount of DNA, inherited only from the mother.

The Slim Shady LP changed Eminem's career

Eminem released The Slim Shady LP in early 1999 on Dr. Dre's Aftermath label. It introduced his alter ego Slim Shady and won a Grammy for Best Rap Album. The record pushed Eminem from Detroit's underground rap scene into mainstream controversy and commercial success within a single year.

Eggplant defines Greek moussaka

Traditional Greek moussaka is built around layers of eggplant, ground meat and béchamel sauce. While regional versions exist across the Balkans and the Middle East, the Greek version is the one most commonly known internationally. The dish is often baked in a deep pan and served in square slices, similar to lasagna.