Time to read a book. Time to wash dishes. Time to do this orthat. You say things like this every day, all the time. But therewas a time when time itself was undefinedno one knew the differencebetween a minute, an hour, or a day. Then people started creatingtools to measure time. First they used the big stuff around themthesun, the moon, water. Soon after, using the knowledge they got fromtheir natural time-telling tools, people began to build clockshugeclocks unlike the ones we use today. They also used their knowledgeof the sun and moon to create calendars made up of months andyears. Now, centuries later, we have clocks all around us. We caneasily figure out how long a month is. But it took many years oftinkering and inventing to perfect the art of telling time. Youcould take a few moments now to read all about time. If you have aminute, that is.