Things to do: Produce (rather unhealthy) gases

Electric discharges in air usually produce energy-rich compounds such as ozone and nitrogen oxides. Although I havn't managed to find out exactly which compound in which case, I differentiate three different ones (by their smell):

CAUTION: ozone and nitrogen oxides are quite poisonous. It is not advisable to inhale large doses of it, be it willingly (to test the smell) or not knowingly (when just playing around). If you notice these smells or you even get a headache, you should have a break, open the window and leave the room.

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Jochen Kronjaeger