Famous discoveries have significantly shaped our understanding of the world. One notable example is the discovery of penicillin by Alexander Fleming in 1928, which revolutionized medicine by introducing antibiotics. This breakthrough has saved countless lives and paved the way for modern treatments of bacterial infections. Another important discovery is gravity, formulated by Isaac Newton in the 17th century. Newton's laws of motion and universal gravitation explained how objects interact and move, laying the foundation for classical physics. These discoveries have had lasting impacts on science, technology, and our daily lives.