给我三个有关科学发现的例子，并解释它们为什么很重要。
1. Darwin's theory of evolution: Darwin's theory of evolution by natural selection fundamentally changed the way we understand the development of species. It helped us understand how changes in the environment could influence the survival and adaptation of different species, and gave us a framework for studying genetics and inheritance.

2. Newton's laws of motion: Newton's three laws of motion laid out the fundamental principles of physics and helped us understand how objects move and interact with each other. These laws made it possible to develop the technology behind modern transportation, such as cars, airplanes, and spacecraft.

3. Watson and Crick's discovery of DNA structure: Watson and Crick's discovery of the double helix structure of DNA was a crucial breakthrough in the study of genetics and the foundation for the emerging field of molecular biology. Their discovery made it possible to study DNA's role in genetic inheritance and led to advances in medicine, such as gene therapy and personalized medicine.