The #100HappyDays challenge is an international social media experiment that is challenging people to be happy every day for 100 days.
According to the 100happydays.com website, a majority of people don't have the time to be happy every day.
The challenge is to post a picture on Facebook, Twitter, or Instagram of what made people happy every single day for 100 days using the hashtag #100HappyDays.
According to the site, the challenge puts people in a better mood every day, makes them more optimistic and has even helped some to fall in love.
Here are 39 things that made people happy every day in the #100HappyDays challenge: