Hale Telescope mirror.. It was completed in 1948 and is still in active use. The Hale Telescope represented the technological limit in building large optical telescopes for over 30 years. It was the largest telescope in the world until the Russian BTA-6 was built in 1976, and the second largest until the construction of the Keck Observatory Keck 1 in 1993. Hale supervised the building of the telescopes at the Mount Wilson Observatory with grants from the Carnegie Institution of Washington: the telescope in 1908 and the telescope in 1917. These telescopes were very successful, leading to the rapid advance in understanding
The World Until Yesterday The World Until Yesterday The World Until Yesterday: What Can We Learn from Traditional Societies? is a 2012 popular science book by American intellectual Jared Diamond. It explores what people living in the Western world can learn from traditional societies, including differing approaches to conflict resolution, treatment of the elderly, childcare, the benefits of multilingualism and a lower salt intake. "The World Until Yesterday" has had a mixed reception. Abby O'Reilly of "The Independent" called it "essential reading" that "cements [Diamond's] position as the most considered, courageous and sensitive teller of the human story writing today." In "The New York