The most dense computer memory circuit ever fabricated — capable of storing around 2,000 words in a unit the size of a white blood cell — was unveiled by scientists in California. The team of experts at the California Institute of Technology (Caltech) and the University of California, Los Angeles (UCLA) who developed the 160-kilobit memory cell say it has a bit density of 100 gigabits per square centimeter, a new record. The cell is capable of storing a file the size of the United States’ Declaration of Independence with room left over, Caltech said in a statement.