| Tensor |
To make an Earth sandwich you must:
1. Put a piece of bread on the ground.
2. Have someone else put a piece of bread on the ground directly on the other side of the Earth from you.
3. Do this at the same exact time, so the Earth at that moment is "sandwiched" between two pieces of bread.
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There is a >Google Map Tool< to assist you.
And a >You Tube video< of people actually doing it.