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Science  12 Apr 2002:
Vol. 296, Issue 5566, pp. 247
DOI: 10.1126/science.296.5566.247

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Dynamic random access memory (DRAM) sets the standard for packing the most information into the least amount of space, with the smallest bits currently measuring just over a tenth of a square micrometer in area. But DRAM must be refreshed thousands of times a second, so for some tasks computers also use other types of memory.