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I have one. Ring finger of the left hand. It's mostly useful for rapidly-changing magnetic fields and strong static fields, so I can feel things like:

- the transformer in my laptop charger

- the electric motors in laptop fans and my hair clippers

- the closure magnets on my laptop

- the magnet in Arc mice that holds the dongle on

- the cyclotron in microwave ovens

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Why'd you get it? Do you enjoy it? Is it interesting to you still? Are there any risks?

I got it because it seemed like it'd be an interesting experience, and it has been. It's still interesting, but not as much as it was, and I've been beginning to think about removing it; if it ever becomes a problem for any reason, I wouldn't hesitate to do so.

It's not a hugely risky thing. My biggest concern is/was the bioproofing on the magnet becoming damaged.

What do they say at airport security with magnetic metal under your fingertips?

I haven't been through airport security yet, haha.

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