Question: The armillary sphere, a three-dimensional representation of the movements in the celestial sphere, was invented in Han China by the 1st century BC. Using a water clock, waterwheel and a series of gears, the Court Astronomer Zhang Heng (78139 AD) was able to mechanically rotate his metal-ringed armillary sphere. To address the problem of slowed timekeeping in the pressure head of the inflow water clock, Zhang was the first in China to install an additional tank between the reservoir and inflow vessel. Zhang also invented a seismometer (Houfeng didong yi ) in 132 AD to detect the exact cardinal or ordinal direction of earthquakes from hundreds of kilometers away. This employed an inverted pendulum that, when disturbed by ground tremors, would trigger a set of gears that dropped a metal ball from one of eight dragon mouths (representing all eight directions) into a metal toad's mouth.
Try to answer this question if possible: What was exchanged from mouth to mouth in the usage of the seismometer?
Answer: metal ball
Question: Mark Z. Jacobson, professor of civil and environmental engineering at Stanford University and director of its Atmosphere and Energy Program says producing all new energy with wind power, solar power, and hydropower by 2030 is feasible and existing energy supply arrangements could be replaced by 2050. Barriers to implementing the renewable energy plan are seen to be "primarily social and political, not technological or economic". Jacobson says that energy costs with a wind, solar, water system should be similar to today's energy costs.
Try to answer this question if possible: What is a barrier to implementing the non-renewable energy plan?
Answer: unanswerable
Question: In March 1875, Bell and Pollok visited the famous scientist Joseph Henry, who was then director of the Smithsonian Institution, and asked Henry's advice on the electrical multi-reed apparatus that Bell hoped would transmit the human voice by telegraph. Henry replied that Bell had "the germ of a great invention". When Bell said that he did not have the necessary knowledge, Henry replied, "Get it!" That declaration greatly encouraged Bell to keep trying, even though he did not have the equipment needed to continue his experiments, nor the ability to create a working model of his ideas. However, a chance meeting in 1874 between Bell and Thomas A. Watson, an experienced electrical designer and mechanic at the electrical machine shop of Charles Williams, changed all that.
Try to answer this question if possible: Who ran the Smithsonian in 1875?
Answer: Joseph Henry
Question: In 1968, Schwarzenegger and fellow bodybuilder Franco Columbu started a bricklaying business. The business flourished thanks to the pair's marketing savvy and an increased demand following the 1971 San Fernando earthquake. Schwarzenegger and Columbu used profits from their bricklaying venture to start a mail order business, selling bodybuilding and fitness-related equipment and instructional tapes.
Try to answer this question if possible: With which of his friends did Schwarzenegger start a bricklaying company?
Answer:
Franco Columbu