Our Galaxy has about 10 ^ 11 stars, that is, for every person on Earth there are about 10 stars in the Galaxy. And how many mosquitoes are there per person on Earth? To answer this question, you just need to go into the forest on a warm summer evening. Already a few minutes will be enough for you to make sure that there are clearly more than 10 of them, and thereby solve this problem.
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.