Search Results: Chemical

Robert Boyle (1627-1691) was an Anglo-Irish chemist, physicist, and experimental philosopher. Boyle was a prolific author, made significant experiments with air pumps, and presented the first litmus test. A founding member of the Royal Society...

The Meiji period refers to the period in Japanese history from 1868 to 1912 during which the Meiji Emperor reigned. Following the overthrow of the Tokugawa shogunate in the Meiji Restoration of 1868, Japan's new leaders embarked on a program...

The germ theory, which emerged in the late 19th century, demonstrated that microscopic germs caused most human infectious diseases. The germs involved included bacteria, viruses, fungi, protozoa, and prions. Louis Pasteur (1822-1895), a French...

Alchemy is an ancient practice aimed at recreating precious substances using recipes and transformative materials such as the philosopher's stone. Alchemists believed that materials like gold, silver, gems, and purple dye could be recreated...

The Romans are known for their remarkable engineering feats, be they roads, bridges, tunnels, or their impressive aqueducts. Their constructions, many of them still standing, are a testament to their superior engineering skills and ingenuity...

Gold, chemical symbol Au (from the Latin aurum meaning 'shining dawn'), is a precious metal which has been used since antiquity in the production of jewellery, coinage, sculpture, vessels and as a decoration for buildings, monuments and statues...

Orichalcum ("mountain copper") or aurichalcum ("gold copper") was a metal used in coins during ancient times. Orichalcum was a golden-yellow coloured mixture consisting of both copper and zinc and referred to as brass. The Romans were the...

Obsidian is a dark volcanic glass which provides the sharpest cutting edge available in nature. Ancient Mesoamerican cultures greatly esteemed the properties of obsidian, and it was widely traded across the region. Obsidian was used to create...

A great deal has been written about why the prehistoric monument of Stonehenge, in Wiltshire, southern England, was constructed. Perhaps it was designed as a temple to the ancestors, an astronomical calendar, a healing centre or a giant computer...

The electrical telegraph was invented in 1837 by William Fothergill Cook (1806-1879) and Charles Wheatstone (1802-1875) in England with parallel innovations being made by Samuel Morse (1791-1872) in the United States. The telegraph, once...