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When we allow freedom to ring, when we let it ring from every village and every hamlet, from every state and every city, we will be able to speed up that day when all God's children–black men and white men, Jews and Gentiles, Protestants and Catholics–will be able to join hands and sing in the words of that old Negro spiritual: 'Free at last! Free at last! Thank God Almighty, we are free at last!"

Can your cell phone tell if you're happy or overworked?