What Percentage Of Reading Online Information Do We Retain?

My college professors want me to read online textbooks (called e-textbooks). I am highly opposed. I remember hearing from an Encyclopedia Britannica sales-man that we retain way less information when reading online.
I want to present this information to my professor but cannot find the actual percentage.
Does anyone have better researching skills than I do?

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One Response to “What Percentage Of Reading Online Information Do We Retain?”

  • Seiran says:

    I don’t know why college professors would dare question the wisdom of an encyclopedia salesman, exact percentage or no.