Tinderbox contained flint, firesteel, and tinder for starting fires. Prehistoric Europeans used flint and iron pyrites for sparks. Ötzi's mummy (3350-3105 BC) found with tinder fungus
Flame is visible, gaseous part of fire caused by exothermic chemical reaction. Temperature and color depend on fuel type involved in combustion. Flames can become plasma when hot enough with ionized gaseous components
Fire consists of fuel, light, and gases produced by combustion. Most flames contain carbon dioxide, water vapor, nitrogen, and oxygen. Incomplete combustion produces soot containing mainly carbon. Fire can occur without oxygen using different oxidizers like chlorine
Fever is a body temperature above 100.4°F, indicating an immune system response. Normal body temperature ranges from 97 to 99°F. Low-grade fever is typically 99.5 to 100.3°F
Flint is obtained by breaking gravel, which is found underwater and in caves. Iron ore is mined underground using a stone pickaxe. Iron ore requires a furnace to be smelted into an iron ingot
Start with a teardrop shape and gradually bend its lines to create flickering effect. Add two smaller teardrop shapes to give flame dimension. Color the smallest teardrop yellow, medium orange, and biggest red. Remove pencil outlines for more realistic appearance