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In May 1769, Gaspar de Portolà established the Fort Presidio of San Diego on a hill near the San Diego River. It was the first settlement by Europeans in what is now the state of California. In July of the same year, Mission San Diego de Alcalá was founded by Franciscan friars under Junípero Serra. By 1797, the mission boasted the largest native population in Alta California, with over 1,400 neophytes living in and around the mission proper. Mission San Diego was the southern anchor in California of the historic mission trail El Camino Real. Both the Presidio and the Mission are National Historic Landmarks.

Who did Junipero Serra commission to found the Mission San Diego de Alcala in 1769?
Answer: Franciscan friars
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Hydrogen was liquefied for the first time by James Dewar in 1898 by using regenerative cooling and his invention, the vacuum flask. He produced solid hydrogen the next year. Deuterium was discovered in December 1931 by Harold Urey, and tritium was prepared in 1934 by Ernest Rutherford, Mark Oliphant, and Paul Harteck. Heavy water, which consists of deuterium in the place of regular hydrogen, was discovered by Urey's group in 1932. François Isaac de Rivaz built the first de Rivaz engine, an internal combustion engine powered by a mixture of hydrogen and oxygen in 1806. Edward Daniel Clarke invented the hydrogen gas blowpipe in 1819. The Döbereiner's lamp and limelight were invented in 1823.

What year was tritium discovered?
Answer: 1934
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In 1775, Patrick Henry delivered his famous "Give me Liberty or Give me Death" speech in St. John's Church in Richmond, crucial for deciding Virginia's participation in the First Continental Congress and setting the course for revolution and independence. On April 18, 1780, the state capital was moved from the colonial capital of Williamsburg to Richmond, to provide a more centralized location for Virginia's increasing westerly population, as well as to isolate the capital from British attack. The latter motive proved to be in vain, and in 1781, under the command of Benedict Arnold, Richmond was burned by British troops, causing Governor Thomas Jefferson to flee as the Virginia militia, led by Sampson Mathews, defended the city.

What was the capital of Virginia prior to Richmond?
Answer:
Williamsburg