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Twins on the road
How one can picture the situation of the travelling twin, using a simple geometric analogy
The case of the travelling twins
Why the so-called "twin paradox" isn't really a paradox
The definition of "now"
Why it is necessary to define simultaneity, and how best to go about defining it.
Time dilation on the road
How you can picture the relativity of simultaneity and time dilation, using a simple geometric analogy