A University of Vermont study, which analyzed people’s tweets, found that spending time in the park can make you as happy as you are on Christmas Day. Researchers found that people’s tweets had much more positive language and expressed less negativity following a visit to a park – and the good feelings lasted up to four hours afterwards. Researchers say the happy Twitter posts of park goers rivaled the positive tweets on Christmas Day, which is apparently the happiest day of the year on Twitter.