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The magazine archive includes every article published in
Communications of the ACM
for over the past 50 years.
September 2019 (Vol. 62, No. 9)
August 2019 (Vol. 62, No. 8)
July 2019 (Vol. 62, No. 7)
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Computers And Society
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Mark Guzdial
The African Enigma: Who Knows More?
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Tally sticks and notched bones are among the oldest digital data carriers.
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September 5, 2019
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