<p>Other animals are driven to spend essentially their whole lives just trying to get fed, stay alive, and get laid. That''s about it. The same was true for our proto-human ancestors. And modern humans of course also require a Survival Drive and a Sex Drive in order to leave descendants. But today we spend most of our lives mainly just trying to convince ourselves that our existence is not absurd. </p><p>In What We Are, Queen''s University biologist, Lonnie Aarssen, traces how our biocultural evolution has shaped Homo sapiens into the only creature that refuses to be what it is - the only creature preoccupied with a deeply ingrained, and absurd sentiment: I have a distinct ''mental life''-an ''inner self''-that exists separately and apart from ''material life'', and so, unlike the latter, need not come to an end. This delusion conceivably gave our distant ancestors some wishful thinking for finding some measure of relief from the terrifying, uniquely