Numerology, Tarot, Reading sun signs
Why do we believe that they're science?
Biased, wrong perception
I think science has been fed to the lions.
The above post says it all. I've also included links there, to Skeptic's dictionary. There are a lot of articles there, you'll find the links to the others from the ones above. Here is another link about the scientific method. These links are important, but easy to understand and read.
Why is pseudoscience important (ie. harmful) ? That's because it discourages critical thinking. It is important to be sceptical and not take everything at face value. It is important to consider the evidence, be aware of your biases before you take a stand on anything, and believe anything. And it is important to know what represents the truth, and how to find it out. Without Critical Thinking, we'd be very easy to manipulate. Unfortunately, astrology, numerology are believed inspite of the fact that they fail to satisfy scientific expperiments. Millions of Rupees are wasted every year on these things which fail to connect with reality. That is why understand pseudoscience is important.
Critical Thinking is an important tool
Without it, anyone, anything would rule
It's essential, to find
The truth, it's kind
Or we'd all be very easy to fool.
I'm not an expert.. the pages I've linked to have articles by people well-versed with science and pseudoscience. So, this post is just a "gateway" to other sources on the net (plus a reason to post a limerick ;-) ).
I do have my thoughts on Astrology, but that is a subject for a later post.