i have ekaterina belinskaya for half an hour. hello and let's get started. from ivory and tortoise shell yes, let's start inventing complex chemical formulas according to tradition from the history of the issue in the middle of the 19th century, there was a shortage of materials of animal origin, elephants were on the verge of extinction, as they continued to be hunted. let's take a look literally at the scientific parts of modern plastic, in order to assess the risks to human health and nature, they can be washed out, leached in a different way , water enters the soil. well, then move along the food chain to various organisms, including the human body. and also let's see how belarusian scientists create a healthy alternative to the usual plastic. eat plastic, as a material of modernity , mankind has been dealing with for a long time, as it turned out, in natural high-molecular compounds or polymers. these are horns, tortoise shell, rubber and shellac , animal horns were deformed when heated and various products were made from them, from medallions to cutler