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British mathematician William Bourne made some of the earliest known plans for a submarine around 1578, but the world’s first working prototype was built in the 17th century by Cornelius Drebbel, a Dutch polymath and inventor in the employ of the British King James I. Drebbel’s sub was probably a modified rowboat coated in greased leather and manned by a team of oarsmen. Sometime around 1620, he used it to dive 15 feet beneath the River Thames during a demonstration witnessed by King James and thousands of astonished Londoners. Unfortunately, none of Drebbel’s plans or engineering drawings has survived to today, so historians can only guess about how his “diving boat” actually operated. Some accounts say it submerged via a collection of bladders or wooden ballast tanks, while others suggest that a sloping bow and a system of weights were used to propel the boat underwater when it was rowed at full speed.
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Answer: Austria's leader and his wife was killed b a Serbian nationalist.
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Martin Luther King Jr., Harriet Tubman, Sojourner Truth, Rosa Parks, W.E.B. Du Bois and Malcolm X.
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A greater demand for slaves, because they could work to grow the cash crops like cotton.
The caesura is the poetic technique that works similar to a comma in terms of sound. <span>This particular poetic device involves creating a fracture within a sentence wherein the two separate parts are distinguishable from one another but still intrinsically linked to one another. Using a caesura serves to create a dramatic pause, which has a strong impact upon the listener or reader. </span>
