Dear, you ask the scientist Tesla a question when you get a chance. Tesla was a famous scientist. I am an electrical engineer. I have read many theories of scientist Tesla. Then you wrote about three wonderful discoveries. Water, electricity, the internet and vaccination are some of the most amazing inventions you've ever seen. I also agree with you. Without the invention of vaccination, we would not be immune from various diseases. If there was no science we would have lived like primitive people fighting animals in the forest. Everyone had to hunt animals for food. Over the ages, science has brought us to the civilized age. All discoveries, big or small, are wonderful. Your writing about science is very beautiful. Good luck to you.