Flexi Says: Einstein's brain was preserved after his death in 1955. Since then, there have been several investigations of parts of his brain and comparisons to small groups of other brains of men who died around the same age. The studies have turned up some interesting observations. However, scientists cannot draw any conclusions about how Einstein's abilities may relate to characteristics of his brain. This is largely due to the limitation of having a sample size of one: Einstein himself. To draw conclusions about how brain structure relates to intelligence, learning, or other abilities would require a larger set of brains for comparison. Some interesting observations from studies of Einstein's brain include: his brain was slightly smaller than average; his brain was slightly wider than average; his prefrontal cortex was larger than average; the grooves on his brain had somewhat unusual patterns; he had an increased number glial cells per neuron in some areas of his brain.