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• Doing
• Part of a schoolteacher's lesson plan
• Pastime
• Show and tell, for one
• What's going on
• An organic process that takes place in the body
• Moving or acting rapidly and energetically
• The trait of being active
• Radiation resulting from radioactive decay
• (chemistry) the capacity of a substance to take part in a chemical reaction
• The state of being active
• A process existing in or produced by nature (rather than by the intent of human beings)