The reason why accepted scientific ideas are reliable is because they "are based on a body of facts and repeated with experimentation." Look at it this way facts are true statements and if a accepted scientific idea is made up of facts it would mean it's reliable. Scientist also proven the idea by observation, and repeated experiments with the same results which would be a good reason why a accepted scientific idea is reliable when writing a research paper or any other type of writing.
The stimulus the thing that stimulates you is the hot pan because you were du.mb and decided to touch the hot pan. The response is you yanking your hand away from the heat because for some reason you thought touching a hot pan was a good idea.