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@NotMeNotYou: Plus, the place NEVER closes. It's open 7 days a week. It only closes on holidays: (Thanksgiving, Christmas, and New Years.)
@DJ-WOLFBEAT5: It's still a safety hazard (since a single spark can cause an explosion) and, since it does displace oxygen, can cause fatigue for people. They are also heavier than air thus more dangerous to small people and children.