Once upon a time, there was a very smart scientist named Professor Albert. He was very good at inventing things and loved to explore new ideas. One day, he had a brilliant idea to create a time machine. He worked very hard and finally, he was able to build it.

Professor Albert was very excited to try out his new invention. He got into the time machine and set the date to go back in time. As he traveled through time, he saw many amazing things. He saw dinosaurs, ancient civilizations, and even met some famous people from history.

But as he traveled further back in time, he started to notice something strange. Every time he changed something in the past, it had a big effect on the present and future. For example, when he stepped on a butterfly, it caused a huge storm in the present. Professor Albert realized that he had to be very careful with his actions in the past.

He decided to go back to the present and try to fix all the changes he had made. But no matter what he did, there were always more problems that came up. He was stuck in a never-ending cycle of trying to fix the past, but only making things worse.

Finally, Professor Albert realized that he couldn't keep going back in time and changing things. He had to accept that the past was the past and he couldn't change it. He learned a valuable lesson that sometimes, our actions can have unintended consequences.

From that day on, Professor Albert used his time machine to only observe the past and learn from it. He became known as the greatest historian of all time and his time machine was used to study history in a whole new way.

The end.