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181) According to Galileo's biographer, what tower did he climb to prove his "Law of Falling Objects" theory?

A biography by Galileo's pupil Vincenzo Viviani stated that Galileo had dropped balls of the same material, but different masses, from the Leaning Tower of Pisa to demonstrate that their time of descent was independent of their mass.

182) Which of the following is a pseudoscience?

Phrenology, which has been disproven, tried to link personality and character to head shape.

183) Why is the study of water called?

Hydrology is the scientific study of the movement, distribution, and quality of water on Earth and other planets.

184) On which ship did Charles Darwin sail around the world?

Darwin's five-year voyage on HMS Beagle established him as an eminent geologist, and publication of his journal of the voyage made him famous as a popular author.

185) What did Evangelista Torricelli invent?

Evangelista Torricelli (1608-1647) was an Italian physicist and mathematician, best known for the invention of the mercury barometer, but also highly regarded for his advances in optics and work on the method of indivisibles.

186) What did Theodoric of Freiberg correctly explain?

While 13th century authors failed to provide an accurate explanation for the rainbow, at the turn of the fourteenth century Theodoric was able to give one of the first correct geometrical analyses of this phenomenon, which was "probably the most dramatic development of 14th and 15th-century optics".

187) Who was the first to accurately describe the human circulatory system?

William Harvey, an English physician, was the first known to describe completely and in detail the systemic circulation and properties of blood being pumped to the brain and body by the heart, though earlier writers, such as Realdo Colombo, Michael Servetus, and Jacques Dubois, had provided precursors of the theory.

188) Which of the following elements is a liquid at room temperature?

Mercury (Hg) and bromine (Br) are the only elements in the periodic table that are liquids at room temperature.

189) How far does the average person walk in a lifetime?

The average moderately active person takes about 7,500 step per day. If you maintain that daily average and live until 80 years of age, you'll have walked about 216,262,500 steps in your lifetime -- the equivalent of walking about 5 times around the Earth.

190) What color is solid krypton?

Solid krypton is white and has a face-centered cubic crystal structure.