Going outside, or looking at pictures of nature, may decrease stress and increase happiness. Greenery has been shown to improve mood, but a recent study has shown that perhaps just looking at a photo of nature may be beneficial. A new study had students look at pictures on a computer screen: “Half the pictures displayed urban spaces full of buildings and parked cars; the rest were green places…Having viewed the photos, the students tackled a series of increasingly difficult computerized math… When the students saw green spaces after the math stressor, their parasympathetic nervous systems kicked in, lowering heart rates, for example.” The green space pictures did not help the students’ stress when viewed before the test, they only helped afterwards to calm down and de-stress.