And there has never lived a scientist without prejudice! Read about the disagreements between Edison, Tesla, and Westinghouse for some fascinating examples of disputes in science due to preconceived prejudice of one type or another.

Scientists are subjective and fallible, despite their conscious desire to be objective. They are creatures of time and place and culture, just like other people, and they serve hidden agendas just like other people.

As Carol says, spirit is freely available everywhere at every time. This may be why materialists are completely uninterested in it! It can't be hoarded or controlled for marketing purposes.

Mind you, certain unscrupulous religions have tried to do that from time to time... :-)