If you are like me, there is always a half empty water bottle in your vehicle. I never would have guessed that it would be a fire hazard. In a test conducted by Oklahoma's Midwest City Fire Department, sunlight magnified by a water bottle reached 250 degrees. The sunlight uses the liquid and the clear material to develop a focused beam which can cause a fire. So be sure you take your water bottles with you when you leave your vehicle. For the full article and videos, click here.