Strict Liability - Abnormally Dangerous Activity

1) the degree of risk of harm to persons or property
2) the magnitude of that harm
3) the inevitability of some risk irrespective of precautionary measures that might be taken
4) the ordinary (or unusual) nature of the activity in the community in which it is found
5) how suited the activity is to the place where the defendant engaged in it
6) the activity's value to the community in comparison to the risk of harm created by its presence

Restatement (Second) of Tort