Relativity Made Easy

Albert Einstein, the great scientist was once asked to explain his theory of relativityin simple words that a layman might follow. “Well, said Einstein,”I was once walking in the country with a blind friend of mine. The day was hot and I said : “I could enjoy a nice cool drink of white milk”. “Milk?” asked my friend,” drink I can understand, but what is white”? “The colour of a swan’s feather”, I said. “Feather I can understand but what is a swan?” “ A bird with a crooked neck”, I said. Neck I can understand, but what is crooked?” At that, I gently took his arm and straightened it. “That is straight”,  I said Then I bent at the elbow, “and that is crooked”, I said. “Oh!” exclaimed the blind man, now I understand what you mean by milk”.