Happiness, The feeling of being glad and content, Chemical, A substance made in the body or brain, Dopamine, A brain chemical linked to reward and motivation, Serotonin, A brain chemical that helps you feel calm and happy, Endorphin, A brain chemical that reduces pain and makes you feel good, Contagious, Something that spreads easily from person to person, Experience, Something you go through or do in life, Memory, Something your brain stores from the past, Nostalgia, A happy feeling when you think about the past, Moment, A very short period of time

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