Mình tham khảo các nguồn sau đây: http://www.mayoclinic.com/health/water/NU00283/ Water: How much should you drink every day? - Mayo Clinic mayoclinic.org http://www.allaboutwater.org/water-facts.html http://ga.water.usgs.gov/edu/earthwherewater.html http://ecosalon.com/water/ 10 Amazing Facts about Water Use Worldwide - EcoSalon Considering that less than 1 percent of all the water on the planet is usable freshwater, we’re not nearly as careful as we should be with this precious resource. Here are some amazing facts to put things in perspective. 1. Set in the desert of... ecosalon.com http://envirocivil.com/health-and-wellness/amazing-facts-about-water/ Amazing facts about water Check some amazing,interesting and shocking facts and figures about water. envirocivil.com Mình làm hoàn toàn bằng Photoshop chứ không có ăn cắp từ web nước ngoài rồi về dịch sang tiếng Việt). Mong mọi người đóng góp ý kiến.