Problem: Asthma:

The hygiene hypothesis attempts to explain the increased rates of asthma worldwide as a direct and unintended result of reduced exposure, during childhood, to non-pathogenic bacteria and viruses. It has been proposed that the reduced exposure to bacteria and viruses is due, in part, to increased cleanliness and decreased family size in modern societies. Exposure to bacterial endotoxin in early childhood may prevent the development of asthma, but exposure at an older age may provoke bronchoconstriction. Evidence supporting the hygiene hypothesis includes lower rates of asthma on farms and in households with pets.

What has caused the reduced exposure in childhood?
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A: increased cleanliness and decreased family size in modern societies


Problem: Humanism:

Renaissance humanism was an activity of cultural and educational reform engaged in by civic and ecclesiastical chancellors, book collectors, educators, and writers, who by the late fifteenth century began to be referred to as umanisti – "humanists". It developed during the fourteenth and the beginning of the fifteenth centuries, and was a response to the challenge of scholastic university education, which was then dominated by Aristotelian philosophy and logic. Scholasticism focused on preparing men to be doctors, lawyers or professional theologians, and was taught from approved textbooks in logic, natural philosophy, medicine, law and theology. There were important centres of humanism at Florence, Naples, Rome, Venice, Mantua, Ferrara, and Urbino.

What was the main action of humanism during the Renaissance>
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A: cultural and educational reform


Problem: Diarrhea:

Immunization against the pathogens that cause diarrheal disease is a viable prevention strategy, however it does require targeting certain pathogens for vaccination. In the case of Rotavirus, which was responsible for around 6% of diarrheal episodes and 20% of diarrheal disease deaths in the children of developing countries, use of a Rotavirus vaccine in trials in 1985 yielded a slight (2-3%) decrease in total diarrheal disease incidence, while reducing overall mortality by 6-10%. Similarly, a Cholera vaccine showed a strong reduction in morbidity and mortality, though the overall impact of vaccination was minimal as Cholera is not one of the major causative pathogens of diarrheal disease. Since this time, more effective vaccines have been developed that have the potential to save many thousands of lives in developing nations, while reducing the overall cost of treatment, and the costs to society.

What is responsible for 6% of dearrheal disease?
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A: Rotavirus


Problem: Antenna (radio):

However loss resistance will generally affect the feedpoint impedance, adding to its resistive (real) component. That resistance will consist of the sum of the radiation resistance Rr and the loss resistance Rloss. If an rms current I is delivered to the terminals of an antenna, then a power of I2Rr will be radiated and a power of I2Rloss will be lost as heat. Therefore, the efficiency of an antenna is equal to Rr / (Rr + Rloss). Of course only the total resistance Rr + Rloss can be directly measured.

What is the single factor that can be precisely measured?
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A:
total resistance