"A World of Ideas" is a collection of articles published in the journal "Lettera Matematica Pristem." This series of academic books, published by Springer, offers a deep insight into the world of mathematics, its foundations, history, and diverse applications. The contributions aim to spark the readers' interest and show them that mathematics is not just an abstract concept, but plays an essential role in our daily lives. From its use in technology to ethical decisions in conflict situations, the omnipresence of mathematics in various areas of life is highlighted. The collection is aimed at anyone who wishes to develop a deeper understanding of the significance of mathematics, regardless of their prior knowledge.