Did you read about the "twins paradox" in Einstein's theory? Ok, imagine we have twins, 2 girls. We put one of them into the spaceship which will travel with a speed close to the speed of light. The other girl stays on earth. What happens?
According to the theory of relativity, if the twins meet again after the travel ends, their age will be different.
This may explain why one of the sugars is white, the other grey :-)
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Do you know where the Einstein cafe is?
Einstein Coffee: Berlin, Helmut Newton Stiftung:
http://www.helmutnewton.com/location/
Good Luck!
Sugar Cane
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