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If we have the best living conditions in history, why aren't we happy all the time? Why are almost 300 million people on the planet diagnosed with depression? Surely we should be happy and enjoy life?

Anders Hansen's short answer is that we are biological beings. For thousands of years, we have had to survive, not enjoy. The author combines knowledge of evolution, neurobiology, and psychiatric practice to explain why the brain functions the way it does and why we need feelings. Why, when we sleep poorly, sit a lot, look at other people's happiness on Instagram, the brain reacts in the style of "this world is dangerous", "my life is worthless", "I am not good enough or good enough."