Lyme disease is diagnosed clinically based on symptoms, objective physical findings (such as EM, facial palsy, or arthritis), or a history of possible exposure to infected ticks, as well as serological blood tests. The EM rash is not always a bull's eye, i.e., it can be solid red.
Rule of Thumb for Changing Filters. The rule we have followed for 18 years in the filtration industry is to change filters every 6 to 12 months. Six months is almost always optimum, especially in commercial/office settings, and twelve months is as long as you want to go no matter what.
Water Cycle Water can exist either as a solid (ice), a liquid (water), or a gas (water vapor). Water on the on surface of Earth is constantly changing between these three states. Ice can change to become water or water vapor. Water can change to become ice or water vapor. Water vapor can change to become ice or water. These continuous changes in state create a cycle of repeating events. Water continually circulates between the surface of Earth and its atmosphere in what is called the hydrologic or water cycle.