 We can deal quickly with the view called ‘vitalism’ (defended by Hans Driesch, 1908 and 1914, among others), which holds that being alive consists in containing some special substance called ‘life.’ Vitalism is a nonstarter since it is unclear what sort of stuff vitalists take life to be, and because no likely candidates—no special stuff found in all and only in living things—have been detected. Moreover, vitalism faces a further difficulty, which Fred Feldman calls ‘the Jonah Problem’: a dead thing, such as a whale, may have a living thing, say Jonah, inside it; if Jonah has ‘life’ inside him, then so does the whale, but by hypothesis the whale is not alive. Of course, in this example Jonah is in the whale’s stomach, not in its cells, but the difficulty cannot be solved by saying that an object is alive if and only if it has ‘life’ in its cells, as an infectious agent (organisms with ‘life’ in them) could survive, for a time, within the dead cells of a dead whale.