In my lifetime, I have witnessed a number of remarkable changes, ranging from technological advances to changes in the way we interact with each other. Here are some of the biggest changes I have seen in my lifetime:

1. Technology: Technology has advanced at an astonishing rate in my lifetime. I remember when the first cell phones were introduced, and now we have devices that are more powerful than the computers used to send a man to the moon. We now have access to the internet, which has revolutionized the way we communicate, access information, and learn.

2. Social Media: Social media has completely changed the way we interact with each other. We now have the ability to connect with people from around the world, share our thoughts and experiences, and stay up to date with current events.

3. Globalization: Globalization has made the world a much smaller place. We can now travel to any corner of the globe with relative ease, and our economies are now more interconnected than ever before.

4. Climate Change: Climate change has become a major issue in my lifetime, and it is clear that the effects of human activity on the environment have had a drastic impact on our planet.

5. Political Changes: In my lifetime, I have seen a number of political changes, both in my own country and around the world. We have seen the fall of the Soviet Union, the rise of China, and the election of the first African-American president in the United States.

These are just a few of the biggest changes I have seen in my lifetime. It is amazing to think about how much the world has changed in such a short period of time, and I am excited to see what the future holds.