Thanatology is the acaemic, and often scientific, study of death among human beings. It investigates the circumstances surrounding a person's death, the grief experienced by the deceased's loved ones, and larger social attitudes towards death such as ritual and memorialization. It is primarily an interdisciplinary study, frequently undertaken by professionals in nursing, psychology, sociology, psychiatry, social work and veterinary science. It also describes bodily changes that accompany death and the after-death period.