Which one of the following best describes our current knowledge about the brain and learning?
1) We know that learning is often associated with the formation of new synapses.
2) We know that the brain reaches adult levels of maturity at puberty, enabling young adolescents to think and learn as effectively as adults do.
3) We know that "left-brained" individuals are, on average, more effective learners than "right-brained" individuals.
4) We know that the cortexes of rapid learners are about 20