Children who read biographies once and then self-tested by recalling information vastly outperformed children who reread the biographies multiple times.

“the children that read the biography once and then made a deliberate point to think about that biography in their own mind to effectively test themselves on that material just within their heads over and over but an equal number of times as the kids that read the biographies directly on a page over and over vastly outperformed the kids that read the biographies over and over”