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In science, time is a measure of the interval between events or the duration of events. Time is a non-spatial dimension in which the motion of events can only be in the forward direction, such as in a succession from the past through the present to the future. Despite all science fictions, the laws of physics would not allow traveling backwards in time (i.e., no traveling back to the past). The SI unit of time is the second (s). Other commonly used units of time are the minute (min), hour (h) and day (d).

In theory, time travel into the future is possible. We just have to wait for someone to invent a time machine.

Trivia  •  Fun Facts

Do you know?
Time is money.
We are familiar with this popular saying. In everyday meaning, the word "time" has both economic value and social importance. Time is money. So, don't waste time!