Since the ancient times, humans have always been curious about the world around them. But due to limitations in available tools, explanations to natural phenomena were limited to what their naked eyes could see. Often, what their senses could not explain they tried to explain through religion and magic. Some of these beliefs and explanations were taken as true and absolute for some time. That is until a curious mind comes along and questions such belief. Not only question but also look for proof or evidence of their correctness.