Hans Albert Einstein
Hans Albert Einstein was born on May 14, 1904 in Bern, Switzerland, where his father, Albert Einstein, worked as a clerk in the patent office. His father was of German-Jewish descent and his mother, Mileva Marić, Serbian-Orthodox. His younger brother, Eduard Einstein, was born in 1910 and died in 1965. The fate of his older sister, Lieserl Einstein, Albert Einstein's and Mileva Marić's first child, is unknown. Their parents divorced in 1919 after living apart for five years.
Albert Einstein's brain
The limitation that Diamond admits in her study is that she had only one Einstein to compare with 11 brains of normal intelligence individuals. S. S. Kantha of the Osaka Bioscience Institute criticized Diamond's study, as did Terence Hines of Pace University. Other issues related to Diamond's study point out glial cells continue dividing as a person ages and although Einstein's brain was 76, it was compared to brains that averaged 64 in age (eleven male brains, 47–80 years of age). Diamond in her landmark study "On the Brain of a Scientist: Albert Einstein" noted that the 11 male individuals whose brains were used in her control base had died from nonneurologically related diseases. She also noted that "Chronological age is not necessarily a useful indicator in measuring biological systems. Environmental factors also play a strong role in modifying the conditions of the organism. One major problem in dealing with human specimens is that they do not come from controlled environments." Additionally, there is little information regarding the samples of brains that Einstein's brain was compared against such as IQ score, or other relevant factors. Diamond also admitted that research disproving the study was omitted. His brain is now at the Mütter Museum in Philadelphia and two of the 140 sections are on loan at the British Museum.