Dear, if you meet scientist Thomas Alva Edison, ask him a question. By what means did he get the theory of research on electricity. A very good question. Then you wrote about three wonderful discoveries. The invention of electricity, computers and mechanical devices are some of the most amazing inventions you will ever see. I think all scientific discoveries used in daily life are wonderful discoveries. But modern medical science has made our life much easier. So the most amazing discovery I have ever seen is medical science. Without science, we would not have modern transportation systems. Without science, we would not understand civilization. Your writing about science is very beautiful. Good luck to you.