The geocentric universe was proposed by Ptolemy and focuses the Earth in the center of the universe. The heliocentric universe was proposed by Nicolas Copernicus and focuses the Sun as the center of the universe.
However, both have been proved wrong.
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There is no difference.
The difference between the Dsi and the Dsi XL is that the XL has a bigger screen.
The difference between checkers and Chinese checkers is that Chinese checkers are used with marbles.
I don't see a big difference.
Emerald's better.