writing a sci-fi about geomagnetic decay — does this BIF scene hold up scientifically? i'm writing a sci-fi film about a physics teacher who buried his geomagnetic field decay research for nine years. three students piece it together. one scene is set at the Keonjhar banded iron formation in odisha. a character crouches at the rock face, takes a kitchen magnet from his pocket, and tests it: — sticks to the black (magnetite) band — nothing on the red (haematite) band — back to black, the pull returns he says: *"this is a hard drive made of rock. and nobody wiped it."* the script treats the BIF as a palaeomagnetic record — black bands ferrimagnetic, locked to field orientation at deposition. red bands oxidised, non-magnetic. two questions: 1. would a kitchen magnet actually behave that noticeably differently between the two band types? or is that too simplified to work in reality? 2.…