Have a Holly Dolly Christmas sweater

Example of  influence: it might be a photon that bounces of on a waterfall and thus increases the temperature of some water drunk by an animal that is then eaten by X. Example of non influence: a neutrino that starts it's path way outside our possible observable universe and continues to move away from us and doesn't interact with any particle that will ever reach our possible observable universe.

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Buy this shirt: Have a Holly Dolly Christmas sweater

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