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During The Crusades the Muslims and the Christians were trying to secure control holy sites.
An effect that happened during the crusades were that it helped militarize. -
People thought the plague was from impure air caused the plague.
During the black plague people thought the plague was a punishment from god.
People responded to the plague by quarantine and wore plague doctor costumes, they also used flowers to remove bad smells. -
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Galileo Galilei made the first telescope. He made the telescope to observe planets like the rings on Saturn, and the moons of Jupiter.
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Blaise Pascal made the first calculator that can add and subtract, it can also do repeated addition. The way Pascal's calculator worked it by turning a dial.