With more people throughout the world living in urban areas rather than rural ones, homo sapiens can officially be classified as an urban species. People are spending the bulk of their days indoors or in traffic, leading to something journalist Richard Louv calls “nature deficit disorder”. That may sound odd, but it’s actually a real threat to the well-being of the mind. Human beings need nature, as it helps to keep the immune system healthy and the mind happy. In fact, research shows just 15 minutes in nature can make you happier. So make a trip to nature a priority in your day, you won’t regret it for a moment.