Radioactivityproperty exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. It is, in essence, an attribute of individual atomic nuclei. An unstable nucleus will decompose spontaneously, or decay, into a more stable configuration but will do so only in a few specific ways by emitting certain particles or certain forms of electromagnetic energy.
Through e-mail and instant messaging, online communities are created where a gift economy and reciprocal altruism are encouraged through cooperation.
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