- Can’t be made reasonably safe given existing technology.
- The activity imposes a risk of severe harm (incredibly dangerous)
- Activity must be uncommon in the area where its being conducted. (out of context)
- ON MBE: (Δ is strictly liable when there’s a UHA on MBE).
- Anything involving blasting or explosives (dynamite or TNT).
- Highly dangerous chemical or biological agents
- Anything involving nuclear energy or radiation.