Problem: Sino-Tibetan relations during the Ming dynasty:

Shih-Shan Henry Tsai writes that the Yongle Emperor sent his eunuch Yang Sanbao into Tibet in 1413 to gain the allegiance of various Tibetan princes, while the Yongle Emperor paid a small fortune in return gifts for tributes in order to maintain the loyalty of neighboring vassal states such as Nepal and Tibet. However, Van Praag states that Tibetan rulers upheld their own separate relations with the kingdoms of Nepal and Kashmir, and at times "engaged in armed confrontation with them."

Where did the Yongle Emperor send Yang Sanbao?
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A: Tibet


Problem: Incandescent light bulb:

During ordinary operation, the tungsten of the filament evaporates; hotter, more-efficient filaments evaporate faster. Because of this, the lifetime of a filament lamp is a trade-off between efficiency and longevity. The trade-off is typically set to provide a lifetime of several hundred to 2,000 hours for lamps used for general illumination. Theatrical, photographic, and projection lamps may have a useful life of only a few hours, trading life expectancy for high output in a compact form. Long-life general service lamps have lower efficiency but are used where the cost of changing the lamp is high compared to the value of energy used.

What is the typical goal for the life of a tungsten filament bulb?
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A: several hundred to 2,000 hours


Problem: Race (human categorization):

Witherspoon et al. (2007) have argued that even when individuals can be reliably assigned to specific population groups, it may still be possible for two randomly chosen individuals from different populations/clusters to be more similar to each other than to a randomly chosen member of their own cluster. They found that many thousands of genetic markers had to be used in order for the answer to the question "How often is a pair of individuals from one population genetically more dissimilar than two individuals chosen from two different populations?" to be "never". This assumed three population groups separated by large geographic ranges (European, African and East Asian). The entire world population is much more complex and studying an increasing number of groups would require an increasing number of markers for the same answer. The authors conclude that "caution should be used when using geographic or genetic ancestry to make inferences about individual phenotypes." Witherspoon, et al. concluded that, "The fact that, given enough genetic data, individuals can be correctly assigned to their populations of origin is compatible with the observation that most human genetic variation is found within populations, not between them. It is also compatible with our ﬁnding that, even when the most distinct populations are considered and hundreds of loci are used, individuals are frequently more similar to members of other populations than to members of their own population."

How many genetic markers need to be used to show people from different groups are dissimilar to each other?
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A: thousands


Problem: Post-punk:

Also emerging during this period was New York's no wave movement, a short-lived art and music scene that began in part as a reaction against punk's recycling of traditionalist rock tropes and often reflected an abrasive, confrontational and nihilistic worldview. No wave musicians such as the Contortions, Teenage Jesus and the Jerks, Mars, DNA, Theoretical Girls and Rhys Chatham instead experimented with noise, dissonance and atonality in addition to non-rock styles. The former four groups were included on the Eno-produced No New York compilation, often considered the quintessential testament to the scene. The no wave-affiliated label ZE Records was founded in 1978, and would also produce acclaimed and influential compilations in subsequent years.

What type of a view did no wave have?
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A:
an abrasive, confrontational and nihilistic