Which of the following questions do you think can be answered scientifically?
1. Does watching television before the age of one contribute to the development of autism in children?
2. Did the use of the herbal supplement ephedra cause the death of the 18-year-old soccer player?
3. Does global warming cause an increase in frequency and intensity of forest fires?
4. Do cactus spines reduce herbivory?
5. Should human embryonic stem cells be used to treat Parkinson’s disease?