Problem: Hunter-gatherer societies manifest significant variability, depending on climate zone/life zone, available technology and societal structure. Archaeologists examine hunter-gatherer tool kits to measure variability across different groups. Collard et al. (2005) found temperature to be the only statistically significant factor to impact hunter-gatherer tool kits. Using temperature as a proxy for risk, Collard et al.'s results suggest that environments with extreme temperatures pose a threat to hunter-gatherer systems significant enough to warrant increased variability of tools. These results support Torrence's (1989) theory that risk of failure is indeed the most important factor in determining the structure of hunter-gatherer toolkits.
What was found to be one of the many significant factors affecting hunter-gatherer tool kits?
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Answer: unanswerable

Problem: A large portion of music played on this format are either considered oldies or recurrent. It often deals with modern romantic and sexual relationships (and sometimes other adult themes such as work, raising children, and family) in a thoughtful and complex way. Soft AC, which has never minded keeping songs in high rotation literally for years in some cases, does not appear necessarily to be facing similar pressures to expand its format. Soft AC includes a larger amount of older music, especially classic R&B, soul, and 1960s and 1970s music, than hot AC.
Music from what two decades is notably featured on the soft AC format?
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Answer: 1960s and 1970s

Problem: Early-years education is quite common in Thuringia. Since the 1950s, nearly all children have been using the service, whereas early-years education is less developed in western Germany. Its inventor Friedrich Frobel lived in Thuringia and founded the world's first Kindergartens there in the 19th century. The Thuringian primary school takes four years and most primary schools are all-day schools offering optional extracurricular activities in the afternoon. At the age of ten, pupils are separated according to aptitude and proceed to either the Gymnasium or the Regelschule. The former leads to the Abitur exam after a further eight years and prepares for higher education, while the latter has a more vocational focus and finishes with exams after five or six years, comparable to the Hauptschule and Realschule found elsewhere in Germany.
For how long have Thuringian children been using the current education system?
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Answer:
Since the 1950s