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Attics and basements are often used for storage, but these places are usually not the best homes for old artifacts. Books, photographs, and papers need to live in environments with moderate and stable temperatures and relative humidity. Extreme heat and temperature fluctuations can make paper brittle (the fibers weaken as they constantly expand and contract), while high humidity causes mold and mildew. Keep books and papers away from direct sunlight or bright artificial light to prevent fading and damage from ultraviolet radiation. Valuables should not be stored near potential sources of water damage (such as basement floors that may flood, water pipes, and washing machines) and heat damage (such as radiators, fireplaces, and appliances that produce heat). Dehumidifiers and fans that circulate clean air can help if you must use your attic or basement. Dirt and dust are no friends of longevity, so good housekeeping is a must.