donate blood, donate organs, use your body for scientific research, have no kids or just one, have many children, donate money to charity, give money to beggars / homeless people, offer your seat on public transport, participate in a protest, join the army, help your neighbour with a problem in their home, living to 100, pick up rubbish in a public place, visit old people, pay taxes, join online discussions to voice opinions, smile at people in the street, paint walls in the city's street, play music or sing in the street

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