Five facts about time that will hurt your brain:

1. The Most Accurate Clock in the World

Atomic clocks help scientists to keep time. The National Institute of Standards and Technology in Colorado, gauges the cesium atoms vibrations to monitor time. It won't loose one second, even after 300 million years, which is not really a big deal.

2. Gravitational Time Dilation

Gravity has an effect to the flow of time according to the relativity theory of Einstein, that the closer an observer is to the gravity's source, like Earth, the slower time goes. Atomic clocks are synchronized at various levels such as mountaintop on an airplane or sea level that will show various times.

3. The Land Before Time

Time has not always existed, as we perceived it. The relativity theory of Einstein concludes, that time starts with the Big Bang, at 13.7 billion years ago. As time and space are related, it's not likely to have time without action, that is, objects move in space. The Big Bang establishes all matter into motion from a very tiny point. Just like the idea of latitude starts at the North Pole, think of it this way, you can't go further than the North Pole. At the same time, it can't be gauged time prior the Big Bang.

4. Living in the Past

David Eagleman is a neuroscientist; everyone lives about 80 milliseconds in the past. The human brain doesn't believe current events until after split-second they happen. It's the brain's way of the world to synchronize time. The hand clapping reaches light and before the sound does, brains recognizes them at the same time.

5. The Big Slowdown

Time is slowing down on Earth, because of the solar day is lengthening by 2 milliseconds each century as the Earth rotates and the tidal friction from the moon. There is 25 hours a day in about 200 million years.