The act of smiling releases molecules in your brain called neuropeptides, which help you fight off stress. Then come smaller neurotransmitters such as serotonin (which acts as an anti-depressant) and endorphins (which provide mild pain relief). These chemicals may just be tiny molecules floating around in your brain, but they make a big difference in how you feel.

At Upworthy, we’re all about small things making a big difference. Whether it’s the life-giving sound of a baby’s laughter, the delight of a person dancing like no one’s watching or the beauty of a random act of compassion, little doses of joy can go a long way toward creating the kind and peaceful world we all want to live in.

Hope this week’s collection of small, happy things brings some big smiles to your faces!