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The article discussed that problem, indirectly. The earth is always slowing down, so even if you fixed it perfectly it would become broken with time.

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So we keep on fixing it. Big ol' railguns firing mass out into space. (If we run out, borrow some from the moon.)

It would be easier to carefully collide asteroids at an oblique angle.

Wouldn't that make a mess though?

Put the impact zone in your favorite geopolitical enemy's backyard. Kills two birds with one, err, stone.

If we run out, we have problems much worse than varying day length.

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