“Science arouses a soaring sense of wonder. But so does pseudoscience. Sparse and poor popularizations of science abandon ecological niches that pseudoscience promptly fills. If it were widely understood that claims to knowledge require adequate evidence before they can be accepted, there would be no room for pseudoscience. But a kind of Gresham’s Law prevails in popular culture by which bad science drives out good.”
-Carl Sagan
Years ago I met a woman who was training to be a "faith healer". When I inquired about it, she told me that she was attending classes out of a master faith healer's home, for a fee of course, and it was "really working" for her.
While I didn't ask her this I'm sure she also had extensive knowledge of astrology, card reading, rock energy or all other matter of pseudoscience.
What is a Scientist?
A scientist is a person who conducts research to increase knowledge in the natural sciences. They use evidence and research to form hypotheses, test them, and share their findings.
“…it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring. Which attitude is better geared for our long-term survival? Which gives us more leverage on our future? And if our naïve self-confidence is a little undermined in the process, is that altogether such a loss? Is there not cause to welcome it as a maturing and character-building experience?”
-Carl Sagan
To some, it's difficult to make the distinction between science and pseudoscience simply because the mass media is filled with the later. Today, there's a lot more shows about "Aliens have built the pyramids" than Carl Sagan talking about why going faster than the speed of light is impossible without breaking the math currently related to it.
“Pseudoscience is easier to contrive than science, because distracting confrontations with reality—where we cannot control the outcome of the comparison—are more readily avoided.”
-Carl Sagan
A great book on the subject is "The Deamon-Haunted World: Science as a Candle in the Dark" by Carl Sagan (available here).