That being said, while both are dangerous, AC electricity is more dangerous to work with due to these reasons: The human body has a higher impedance to DC currents than AC; humans can withstand higher voltages of DC electricity than AC.
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Current flowing in power lines and normal household electricity that comes from a wall outlet is alternating current. The standard current used in the U.S. is 60 cycles per second (i.e. a frequency of 60 Hz); in Europe and most other parts of the world it is 50 cycles per second (i.e. a frequency of 50 Hz.).
Many in Europe resist due to cost, concern about environmental impact and even suspicions of adverse health impacts from cold air currents, including colds, a stiff neck, or worse. Cooling systems remain rare in Nordic countries and even Germany, where temperatures can nudge above 30C for extended periods.