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Don’t Let A Snowstorm Ruin Your Plans—17 National Park Activities For KidsThat Work Indoors

When the weather turns foul and outdoor adventures are off the table, the spirit of the national parks doesn’t have to vanish ...
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Why ships have two big metal balls on the compass stand, the simple fix for a steel ship’s magnetic errors

Modern steel ships warp a magnetic compass with both permanent and induced magnetism, and the binnacle is packed with clever countermeasures to cancel it out. This breaks down hard iron vs soft iron ...