Answer: The glacial-interglacial cycle is triggered by changes in Earth's orbit around the Sun, and, as a result, there is approximately 100,000 years between interglacials (or glacials).
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Smallpox has had a major impact on world history, not least because indigenous populations of regions where smallpox was non-native, such as the Americas and Australia, were rapidly decimated and weakened by smallpox. During the 18th century the disease killed an estimated 400,000 Europeans each year, including five reigning monarchs, and was responsible for a third of all blindness. After successful vaccination campaigns throughout the 19th and 20th centuries, the WHO certified the global eradication of smallpox in December 1979. Smallpox is one of two infectious diseases to have been eradicated.
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Chain of islands southeast of the Virgin Islands is Bermuda. It's huge Royal Naval Dockyard complex joins present day attractions like the intuitive Dolphin Quest with oceanic history at the National Museum of Bermuda. The island has a particular mix of British and American culture, which can be found in the capital, Hamilton.
A hurricane (or typhoon) is a large rotating cyclonic system born in the ocean.
