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Your gut should tell you that time and distance are set in stone: if you're 5'6" and 40 years old, you're 5'6" and 40 years old, and if anyone disagrees they're probably a jackass. And you're not alone. For thousands of years scientists and people have known that you only need one clock in your town, no matter where you are or how fast you're moving, because it's not like time is going to pull a fast one on you... Then one day Einstein demonstrated that everybody's gut was wrong but his, forever cementing his status as history's greatest jackass.  Here's how: Way back when, Galileo came up with a principle showing how things are equivalent.  The aptly named "Galilean Equivalence Principle" states that science works the same whether you're moving or not.  Still, that's something everyone knows.  You can juggle in a car, the same as you can sitting on a bench. And no one ever tried to get chemistry to work different by running fast. For years that was fine.  It was very useful to scientists, and interesting to people who think that "1+2=12" is funny. Maxwell, a physicist studying electricity and magnetism, came up with four equations called "The Maxwell Equations".  These imply that the speed of light is a derivable quantity based on physical laws. If you assume that the Galilean equivalence principle and Maxwell's equations are true you get "Einstein's Equivalence Principle", which states that the speed of light is the same to all observers. That shouldn't make any sense, and the more you think about it the less sense it should make.