About this episode
今天我的gifted课程做了一个实验，制作了一种黑乎乎的液体。当用磁铁靠近时，液体就在磁铁的吸引力作用下，呈现出刺猬般的奇怪形状。液体能被磁力吸引，看上去非常古怪。这种液体就是ferrofluid，铁磁流体。液体里有很细小的铁磁微粒。如何制作这种让人惊叹的液体呢？我们用到的材料你在家里也可以获得，那就是......
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