The brain of Albert Einstein has been a subject of much research and speculation. Albert Einstein's brain was removed within seven and a half hours of his death. His apparent regularities or irregularities in the brain have been used to support various ideas about correlations in neuroanatomy with general or mathematical intelligence. Studies have suggested an increased number of glial cells in Einstein's brain. Fate of the brain Einstein's autopsy was conducted in the lab of Thomas Stoltz Harvey. Shortly after Einstein's death in 1955, Harvey removed and weighed the brain at 1230g. Harvey then took the brain to a lab at the University of Pennsylvania where he dissected it into several pieces. Some of the pieces he kept to himself while others were given to leading pathologists. He hoped that cytoarchitectonics, the study of brain cells under a microscope, would reveal useful information. Harvey injected 50% formalin through the internal carotid arteries and afterward suspended the intact brain in 10% formalin. He also photographed the brain from many angles. Harvey dissected the brain into about 240 blocks (each about 1 cm3) and encased the segments in a plastic-like material called collodion. Harvey also removed Einstein's eyes. He gave them to Henry Abrams, Einstein's ophthalmologist. Whether or not Einstein's brain was preserved with his prior consent is a matter of dispute. Ronald Clark's 1979 biography of Einstein states "he had insisted that his brain should be used for research and that he be cremated." More recent research has suggested that the brain was removed and preserved without the permission of either Einstein or his close relatives. Hans Albert Einstein, the physicist's elder son, endorsed the removal after the event. However, he insisted that his father's brain should be used only for research to be published in scientific journals of high standing. In 1978, Einstein's brain was rediscovered in Harvey's possession by journalist Steven Levy. Its sections had been preserved in alcohol in two large mason jars within a cider box for over 20 years. The brain was driven across many U.S. states and to Hamilton, Ontario, accompanied by Harvey. A journalist and chauffeur, Michael Paterniti, wrote about some of the journeying that took place in 1997. In 2010, Harvey's heirs transferred all of his holdings constituting the remains of Einstein's brain to the National Museum of Health and Medicine. This included 14 photographs of the whole brain (which was now