What are the most important development in last 100 years?

In the last 100 years, some of the most significant developments include the advancement of information technology, particularly the internet and smartphones, which have transformed communication and access to information. Medical advancements, such as vaccines and antibiotics, have drastically improved public health and increased life expectancy. Additionally, movements for civil rights and social justice have reshaped societal structures and norms, promoting equality and inclusion worldwide. Lastly, the recognition and urgency of climate change have catalyzed global discussions and actions toward sustainability.