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Actinism is the ability to cause a photochemical reaction through an interaction with radiant energy, particularly visible energy, i.e. light. Actinism made old-fashioned photography possible.

Truth time: I had never heard of actinism before encountering it in this project.

If you are in the same boat and you are worried that you might forget the word actinism or forget its meaning, here’s a little trick to deal with that: Use a digital camera and view your pictures online or on the camera itself. Then there won’t be any actinism involved and you won’t have to worry about actinism ever again.

Problem solved.

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