Category: Article of the Day

Initially a journalist, Philby became a high-ranking member of British intelligence and is believed to have provided the USSR with classified information that caused the deaths of scores of American and British agents. Always in danger of having his cover blown by Soviet defectors, Philby himself defected to the USSR in 1963, after he was exposed as a member of the Cambridge Five spy ring. Philby died in Moscow in 1988. What killed him? Discuss

Acheulean tools are the stone hand axes, cleavers, and other core tools created by prehistoric hominins across Africa, Asia, and Europe during the Lower Paleolithic Period. These tools date from around 1.5 million to 150,000 years ago, and some believe their development represents the genesis of human art, economy, and social organization. Curiously, some sites contain hundreds of hand-axes that are impractically large and apparently unused. What are some theories about their function? Discuss

Instead of asking who voters plan to support in a future election, as is done in opinion polling, pollsters involved in exit polling ask people who they actually voted for as they leave polling stations. Exit polls are usually conducted by firms providing media outlets with an early indication of an election’s outcome, though they have also been used to deter election fraud. Critics, however, maintain that the results of these surveys can be distorted. How might exit polls influence an election? Discuss

The didgeridoo, developed by the Australian Aborigines, is perhaps the world’s oldest wind instrument. Though the exact age of the didgeridoo is unknown, studies of rock art in northern Australia suggest that the Aboriginal people have been using it for approximately 1,500 years. Didgeridoos measure about 4 ft (1.5 m) in length and are made from branches that have been hollowed out by termites. A 2005 study found that practicing the didgeridoo can help reduce what sleep-related conditions? Discuss

High-speed photography allows fast moving phenomena to be recorded with precision and clarity. While in 1948 high-speed photography was defined as a set of at least 3 photographs taken by a camera capable of recording a minimum of 128 frames per second, today’s equipment can shoot as many as 1 million frames per second. High-speed photography was first put to practical use in 1878 to investigate whether or not a trotting horse ever has all 4 feet off the ground at once. What did the images show? Discuss

These puzzles are comprised of mechanically interlinked pieces that must be manipulated in a certain way in order for them to be assembled, disassembled, and otherwise solved. The oldest known example, from the 3rd century BCE, consists of a square divided into 14 parts that fit together to form other shapes. Mechanical puzzles have since taken on myriad forms, including dexterity and disentanglement puzzles, trick vessels, and impossible objects. What is the most well-known impossible object? Discuss

Found in lakes near Mexico City, axolotls are salamanders affected by a phenomenon called neoteny, which means that adults of the species often fail to undergo metamorphosis and reach reproductive maturity without losing their larval characteristics. They are able to regenerate most body parts and are used extensively in scientific research. Axolotls are also commonly kept as pets in several countries and are considered a delicacy in Mexico. What prevents axolotls from undergoing metamorphosis? Discuss

Warfare was a fundamental part of Aztec society and was the driving force behind its economy and religion. The Aztecs used warfare to achieve two main objectives: the subjugation of city states to exact tribute and expand political influence and the taking of captives for religious sacrifice. Members of warrior societies were even ranked according to the number of captives they had taken in battle. Which warrior society’s members swore not to take a step backward during battle on pain of death? Discuss

The first government in history to issue paper money, the Song dynasty was the ruling dynasty in China between 960 and 1279. A culturally rich period for the arts, philosophy, and social life, the dynasty also bolstered naval strength and developed revolutionary new military technology—augmented by the use of gunpowder—to repel invaders. Nevertheless, the Song dynasty was conquered in 1279 by the Mongol ruler Kublai Khan. What nautical tool was invented during the era? Discuss

Known as both the “Mad” and “Bloody” Baron, Baron Roman Ungern von Sternberg was a military commander who became an independent warlord after the Russian Civil War. A mystic who believed he was the reincarnation of Genghis Khan, he aimed to unite the Far-Eastern nations under one monarch. In 1921, he achieved this goal, becoming dictator of Mongolia before being captured by his own troops and executed by the Red Army. How did he trick the Chinese into abandoning Mongolia’s capital city, Urga? Discuss