the.com/magnet
the only rock that earned a permanent argument with iron.
means A material or object that produces a magnetic field, attracting iron and certain other metals (and aligning compass needles).
from From the Greek 'magnes lithos' — the 'stone of Magnesia,' a region in ancient Thessaly where these curious iron-grabbing stones were dug up. The name traveled through Latin 'magnetem' and into English, carrying its hometown with it; the related word 'magnesium' and even 'manganese' grew from the same Greek soil.
- earth itself
- our planet is one giant slow-spinning magnet
- named after
- Magnesia, an ancient Greek region full of lodestone
- no monopoles
- cut one in half, get two complete magnets
- heat kills it
- above the Curie point, magnetism vanishes
- navigation hack
- birds and turtles read magnetic fields to travel
neodymium magnet — strongest permanent magnet, 55 tesla field strength, used in mri machines and hard drives
earth's magnetic field — dipole field generated by molten iron core, 25-65 microtesla strength, protects atmosphere from solar wind
magnetar sgr 1806-20 — neutron star with 10^11 tesla surface field, strongest known magnetic field in universe, discovered 2004