[Português] A Regra dos 85%

# The 85% Rule: Why Getting Everything Right (Or Wrong) Kills Learning [Portuguese content summary] Psycologist Robert Björk's research demonstrates learning is optimized at 85% accuracy. Material learned at this level is retained 50-70% longer than at 95%. At 95%, content is too easy and brain ignores it. At 55%, frustration kills engagement. At 85%, learners experience "desirable difficulty" — challenging but achievable. Neuroimaging shows prefrontal cortex fully engaged, dopamine activates during errors. Amal's HLR adaptive system continuously monitors accuracy and adjusts difficulty, maintaining each child in this optimal 85% zone for maximum learning and motivation.