Two scientific advancements that have greatly impacted society are the invention of the vaccine and the development of the internet.

1. Vaccines (Medicine): Before vaccines, many deadly diseases like smallpox, polio, and measles caused widespread illness and death. Vaccines work by preparing our immune system to fight off these diseases, preventing them from spreading and causing harm. This has led to a significant increase in life expectancy and a healthier global population, allowing children to grow up without fear of many common diseases.
2. Internet (Communication): The internet has revolutionized how we communicate, learn, and access information. It allows instant communication across vast distances through email, video calls, and social media. It also provides access to an immense amount of knowledge, making learning accessible to more people. Furthermore, it has opened up new ways for businesses, entertainment, and even medical consultations, connecting the world like never before.