One-to-one correspondence
"There is one-to-one correspondence among points on the number line for every real number," said my Math Lecturer in one of his Lectures. He was explaining how every number has a place on the number line. However big or however small, the numbers have only one spot. This reminds me of a movie I watched in high school: I want to eat your pancreas. One of the characters says, "Each day is worth as much as the day before it. That is why the value of today doesn't change based on how I spend my time