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  1. ELI5: I’ve always wondered why the metal forms into spiky bits, rather than a rounded off ball, it seems to me that the spikes have much space in between, and I would’ve thought that the magnet would pull it all in, closing up as much space as possible.

  2. So, it’s iron shavings and the bottom board has a magnet in it so it bunches only in the bottom globe.

  3. The material isn’t “falling”, it is getting pulled. Does that mean this is shorter than a minute/hour? Did they account for the magnetic attraction and put more material in it so it goes its full amount of time?

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