Human science is the science of humans: what makes them different from animals, and their limits, which tend to be the same as those of other animals. Because human bodies are animal bodies, human science is part of biology which leads to Life Science. However human behaviour includes the use of words, measures, numbers, knowing time and having memory, and such habits as trade - thus economics and psychology are considered to be part of human science. A general human science is anthropology which studies only the differences between humans and near relatives.