Darwin's aims were twofold: to show that species had not been separately created, and to show that natural selection had been the chief agent of change. He knew that his readers were already familiar with the concept of transmutation of species from Vestiges, and his introduction ridicules that work as failing to provide a viable mechanism. Therefore, the first four chapters lay out his case that selection in nature, caused by the struggle for existence, is analogous to the selection of variations under domestication, and that the accumulation of adaptive variations provides a scientifically testable mechanism for evolutionary speciation.
What were Darwin's two important aims about evolution?
to show that species had not been separately created, and to show that natural selection had been the chief agent of change

Seismology: To better prepare for calamities, Zhang Heng invented a seismometer in 132 CE which provided instant alert to authorities in the capital Luoyang that an earthquake had occurred in a location indicated by a specific cardinal or ordinal direction. Although no tremors could be felt in the capital when Zhang told the court that an earthquake had just occurred in the northwest, a message came soon afterwards that an earthquake had indeed struck 400 km (248 mi) to 500 km (310 mi) northwest of Luoyang (in what is now modern Gansu). Zhang called his device the 'instrument for measuring the seasonal winds and the movements of the Earth' (Houfeng didong yi ), so-named because he and others thought that earthquakes were most likely caused by the enormous compression of trapped air. See Zhang's seismometer for further details.
What was invented in 132 CE?
a seismometer

Having attended art college, Mercury also designed Queen's logo, called the Queen crest, shortly before the release of the band's first album. The logo combines the zodiac signs of all four members: two lions for Leo (Deacon and Taylor), a crab for Cancer (May), and two fairies for Virgo (Mercury). The lions embrace a stylised letter Q, the crab rests atop the letter with flames rising directly above it, and the fairies are each sheltering below a lion. There is also a crown inside the Q and the whole logo is over-shadowed by an enormous phoenix. The whole symbol bears a passing resemblance to the Royal coat of arms of the United Kingdom, particularly with the lion supporters. The original logo, as found on the reverse-side of the first album cover, was a simple line drawing but more intricate colour versions were used on later sleeves.
Which zodiac sign did Deacon and Taylor share?
Leo