You have a drop of bacterial broth. You need to find out, albeit approximately, how many bacteria are in a drop. Figure out how to do this, provided the bacteria are allowed to be killed (you don’t need them alive). Guess what needs to be done to save time. Suggest an idea for a device that will read them automatically.
Touch up the solution – the bacteria will be colored. Dilute the solution. Take a drop, place it on a glass slide and, using a microscope, count the number of microbes in the drop, then multiply by the number of drops of the solution.
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.