Математичний аналіз і диференціальні рівняння вивчаю САМ

Sorry for off-topic, I'm considering about building an instructive web-site as a student. May probably begin with publishing interesting information like"In France, a five year old child can buy an alcoholic drink in a bar"Please let me know if you know where I can find some related facts like here

aviatech.com/en/dissertation-paper-for-s...-the-most-widely-14/