What are different methods for purifying water to drink from streams and how do they differ? What are different methods for purifying water to drink from streams and how do they differ in terms of the microorganisms eliminated? How do boiling water and using a charcoal filter differ as methods to purify stream water to drink? How do boiling water and using a charcoal filter differ as methods to purify stream water to drink in terms of the microorganisms eliminated? What are different methods for treating carpel tunnel syndrome and how do they differ? What are different methods for treating carpel tunnel syndrome and how do they differ in terms of their possible side-effects? How do wrist splints and corticosteroids differ as treatments for carpel tunnel syndrome? How do wrist splints and corticosteroids differ as treatments for carpel tunnel syndrome in terms of their possible side-effects? What are different methods for using herbs as treatment for a cold and how do they differ? What are different methods for using herbs as treatment for a cold and how do they differ in terms of their effectiveness? How do Echinacea and St. John's Wort differ as treatments for a cold? How do Echinacea and St. John's Wort differ as treatments for a cold in terms of their effectiveness? What are different types of motor oil for a car and how do they differ? What are different types of motor oil for a car and how do they differ in terms of their performance? How do synthetic and organic motor oils for cars differ? How do synthetic and organic motor oils for cars differ in terms of their performance? What are different types of rice and how they differ as part of a healthy diet? What are different types of rice and how they differ as part of a healthy diet in terms of their fiber content? How do white rice and brown rice differ as part of a healthy diet? How do white rice and brown rice differ as part of a healthy diet in terms of their fiber content? What are different types of light bulbs and how do they differ? What are different types of light bulbs and how do they differ in terms of the quality of the light they produce? How do compact fluorescent bulbs and LEDs differ? How do compact fluorescent bulbs and LEDs differ in terms of the quality of the light they produce? What are different types of ballet and how do they differ? What are different types of ballet and how do they differ in terms of the physical postures and movements? How do classical ballet and neo-classical ballet differ? How do classical ballet and neo-classical ballet differ in terms of the physical postures and movements? What are different types of material that speaker cones are made out of and how do they differ? What are different types of material that speaker cones are made out of and how do they differ in terms of their ability to accurately reproduce high frequency sounds? How do polypropylene and paper differ as a speaker cone material? How polypropylene and paper differ as a speaker cone material in terms of their ability to accurately reproduce high frequency sounds? What are different types of garden fertilizers and how do they differ? What are different types of garden fertilizers and how do they differ in terms of their nutrient content? How do organic fertilizers differ from chemical fertilizers for garden use? How do organic fertilizers differ from chemical fertilizers for garden use in terms of their nutrient content? What are different types of paint thinner for oil painting and how do they differ? What are different types of paint thinner for oil painting and how do they differ in terms of how they affect the paint color? How do linseed oil and poppyseed oil differ as paint thinner for oil painting? How do linseed oil and poppyseed oil differ as paint thinner for oil painting in terms of how they affect the paint color? What are different types of Wi-Fi routers and how do they differ? What are different types of Wi-Fi routers and how do they differ in terms of signal interference from other devices? How do single band and dual band Wi-Fi routers differ? How do single band and dual band Wi-Fi routers differ in terms of signal interference from other devices? What are different types of plastic and how do they differ regarding their environmental impact? What are different types of plastic and how do they differ regarding their environmental impact in terms of how they can be recycled? How do PET and PVC differ regarding their environmental impact? How do PET and PVC differ regarding their environmental impact in terms of how they can be recycled? What are different breeds of dogs that would be good for your friend and how do they differ? What are different breeds of dogs that would be good for your friend and how do they differ in terms of the amount of exercise they need? How do the Pug and Bichon Frise dog breeds differ as a choice for your friend? How do the Pug and Bichon Frise dog breeds differ as a choice for your friend in terms of the amount of exercise they need? What are different methods are there to help people stop smoking and how do they differ? What are different methods are there to help people stop smoking and how do they differ in terms of their success rate? How do nicotine gum and nicotine patches differ as methods to stop smoking? How do nicotine gum and nicotine patches differ as methods to stop smoking in terms of their success rate? What are different materials used to cover couches and how do they differ? What are different materials used to cover couches and how do they differ in terms of how easy the material is to clean? How do leather and microfiber differ as a covering for a couch? How do leather and microfiber differ as a covering for a couch in terms of how easy the material is to clean? What are different methods for typing Chinese characters on a QWERTY-style keyboard and how do they differ? What are different methods for typing Chinese characters on a QWERTY-style keyboard and how do they differ in terms of how difficult the method is to learn? How do the Pinyin and Wubi methods for typing Chinese characters differ? How do the Pinyin and Wubi methods for typing Chinese characters differ in terms of how difficult the method is to learn? What are materials that skillets are made out of and how do they differ? What are materials that skillets are made out of and how do they differ in terms of how well they distribute heat? How do aluminum and cast iron differ as materials for skillets? How do aluminum and cast iron differ as materials for skillets in terms of how well they distribute heat?