Eventually someone noticed that the lodestones were better at pointing out real directions, leading to the first compasses.
最后有人注意到，天然磁石是在指出真正的方向更好，导致第一罗盘。
15 Where lodestones come from is another mystery of magnetism.
15磁石是怎么来的？这又是一个关于磁的谜团了。
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