Children and teachers of one of the Lviv schools make trench candles for the Ukrainian military in Lviv, December 2, 2022. Such a candle is needed for heating the trenches of the military, and it can also be used to cook food. The principle of its production is to put cardboard in an empty jar, and then pour melted paraffin. (Photo by Pavlo Palamarchuk/Anadolu Agency via Getty Images)
