system
Given the following post, respond as if you're commenting on Reddit:
human
What are some strange things that happen under EXTREME magnetic fields?

I was reading about the magnetar SGR 1806-20, which has a magnetic field of 10^15 Gauss (10^11 Tesla in intensity) . 

The article said that if this magnetar were as close as the moon to Earth, it could re-arrange the molecules in your body. What are some other wacky quantum and macroscopic things that happen under these most powerful magnetic fields in the universe? What could happen under even greater strength fields?
gpt
Many of the things you don't usually consider to be magnetic are actually diamagnetic, which means that any magnetic field will repel them. This effect is usually very weak, but water and graphite are diamagnetic among other things. A sufficiently strong magnetic field would have a repulsive effect on these things. You don't need anywhere near the strength of a magnetar to see these effects though; bismuth is a strong enough diamagnet that it can float suspended between two magnets, and we have electromagnets on earth strong enough to levitate frogs.