Compassionate love, sometimes also called altruistic love, has been a topic of scientific interest and research since the 1990s. It is also closely related to the construct of unlimited love that has been expounded by Stephen G. Post. Compassionate love refers to love that "centers on the good of the other". It is distinct from altruism, compassion, and romantic love. Since 2001, the scientific study of compassionate love has received several million dollars in research support from the Fetzer Institute and the Institute for Research on Unlimited Love (IRUL).