Those sitting by the fire can see sparks flying from the burning logs with a crash. Why do sparks bounce?

Because the air contained between the wood fibers, when heated, greatly increases the pressure on the particles of charred wood.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.