Once upon a time, there was a very smart scientist named Dr. Smith. He was a brilliant inventor and had always dreamed of creating a time machine. One day, after years of hard work and dedication, he finally succeeded in building one.

Dr. Smith was overjoyed and couldn't wait to test out his invention. He climbed into the time machine and set the date for the year 1900. As he pressed the button to activate the machine, he felt a rush of excitement and anticipation.

When he arrived in the past, he was amazed by what he saw. The streets were filled with horse-drawn carriages and people dressed in old-fashioned clothes. Dr. Smith couldn't believe that he was actually in the year 1900!

He decided to explore the city and see what it was like. As he walked around, he noticed that everything seemed different. The buildings were taller, the streets were cleaner, and the people seemed happier. Dr. Smith was fascinated by the past and couldn't resist the urge to make some changes.

He started by helping a poor family who was struggling to make ends meet. He gave them some money and helped them find a better place to live. The family was overjoyed and thanked Dr. Smith for his kindness.

Feeling proud of himself, Dr. Smith continued to make more changes in the past. He helped build schools, hospitals, and even invented new technologies. But as time went on, he started to notice that every action he took had consequences in the present and future.

The changes he made in the past had a ripple effect that caused chaos and destruction in the present. Dr. Smith realized that he had made a grave mistake and that his actions were causing more harm than good.

He quickly returned to the present and destroyed the time machine. From that day on, Dr. Smith vowed to never mess with the past again. He learned that sometimes, it's best to leave things as they are and not try to change the course of history.

And so, the brilliant scientist learned a valuable lesson about the dangers of time travel and lived the rest of his days in peace, knowing that he had made the right decision. The end.