The human condition encompasses the totality of the experience of being human and living human lives. As mortal entities, there are a series of biologically determined events that are common to most human lives, and some that are inevitable for all. The ongoing way in which humans react to or cope with these events is the human condition. However, understanding the precise nature and scope of what is meant by the human condition is itself a philosophical problem. The term is also used in a metaphysical sense, to describe the joy, terror and other feelings or emotions associated with being and existence. Humans, to an apparently superlative degree amongst all living things, are aware of the passage of time, can remember the past and imagine the future, and are intimately aware of their own mortality. Only human beings are known to ask themselves questions relating to the purpose of life beyond the base need for survival, or the nature of existence beyond that which is empirically apparent: What is the meaning of existence? Why was I born? Why am I here? Where will I go when I die?