How fast does our knowledge grow?

In his 1982 book “Critical Path”, futurist and inventor R. Buckminster Fuller estimated that if we were to equate all the knowledge accumulated by mankind by the year one A.D. with one unit of information, it probably took about 1500 years or until the sixteenth century to double that amount of knowledge. The next doubling of knowledge from two to four “units of knowledge” took only 250 years until about 1750. By 1900, 150 years later, knowledge had doubled again to eight units. Today, the rate of doubling is between one and two years.

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