Beyond the answers - interesting background to this quiz

The dwarfs who never made the final cut

In Disney's 1937 film Snow White and the Seven Dwarfs, the seven who made it to the screen are Doc, Grumpy, Happy, Sleepy, Bashful, Sneezy and Dopey. But the animators considered a much longer list of candidates first. Among the rejected names were Jumpy, Deafy, Wheezy, Baldy, Gabby, Nifty, Sniffy, Swift, Lazy, Puffy, Stuffy, Tubby, Shorty and Burpy. "Prof" was another early idea, dropped in favour of Doc, the dwarf who serves as the group's self-appointed leader.

Methane: the gas that quietly shapes our atmosphere

When organic matter decomposes without oxygen, methane is released. This happens in wetlands, rice paddies, landfills and the digestive systems of ruminant animals such as cattle and sheep. Methane is a potent greenhouse gas, trapping far more heat per molecule than carbon dioxide over short timescales, which is why scientists monitor its sources closely. It is also the main component of natural gas, the fuel used in heating and cooking.

From a phonograph to a moon called Titan

Thomas Edison's phonograph, unveiled in the late 1870s, was the first device able to both record and play back sound. Nearly a century later, in 1655, the Dutch astronomer Christiaan Huygens discovered Titan, the largest moon of Saturn. Titan is bigger than the planet Mercury and is the only moon known to have a dense atmosphere. In 2005, the Huygens probe, named after its discoverer, landed on Titan's surface.

The Alps and the Appalachians: two very different ranges

The Alps stretch across eight countries, including Italy, France, Switzerland, Austria and Germany. The Appalachians, by contrast, run through 13 US states, from Alabama in the south to Maine in the north. The two ranges are also geologically different in age: the Appalachians began forming hundreds of millions of years ago, making them far older than the Alps, whose peaks were pushed up much more recently in Earth's history.

A coronation watched around the world

Queen Elizabeth II was crowned at Westminster Abbey in 1953, more than a year after she became queen. The ceremony was televised, a first for a British coronation, and millions of people across the world watched. Elizabeth reigned for 70 years, the longest of any British monarch, before her death in 2022.