I've seen something like this pyramid presented at numerous workshops and inservice training. Well-meaning teachers and trainers put it on 20-foot-tall screens to accompany their presentation. Quoted it as research and I believed.
Today this post from Stephen Downes brought me to
People remember 10%, 20%...Oh Really?
Modern myths of learning: You only remember 10% of what you read - 30 Jun 2008.
I feel foolish because I never questioned the authority of the "research". And now wondering which other modern education myths need myth-busting.