Learners who can copy five predecessors instead of one keep improving: over ten lab generations average skill rose from just above 20% to over 85%, while one-teacher chains did not improve.

Evidence 4 passages

• groundsSource document

  The average skill of each generation did not increase when people could learn from only one teacher.

• groundsSource document

  by acquiring distinct elements from different people, learners can create innovations without inventions.

• groundsSource document

  In the final generation, the least skilled person in the five-model treatment was superior to the most skilled person in the one-model treatment.

• groundsSource document

  the average skill increased dramatically, from just above 20% to over 85%

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