McMaster has received accolades for its research strengths, particularly in the field of health sciences. The Faculty of Health Science oversees $130 million a year in research, much of it conducted by scientists and physicians who teach in the medical school. The university also operates a brain bank, whose collection includes a portion of Albert Einstein's brain, preserved and held for medical research. Researchers there have identified differences in his brain that may relate to his genius for spatial and mathematical thinking. In addition to traditional forms of research, members of Faculty of Health Sciences have also been credited with developments within the medical practice. A McMaster research group led by David Sackett and later Gordon Guyatt had been credited for establishing the methodologies used in evidence-based medicine.