The Blog
Magnets
North, south and the physics of why compasses work.
Magnets
Cut a Magnet in Half and You Get Two Magnets
You can never have a north without a south. Snap a magnet in two and each piece instantly has both ends. Physicists are still looking for the exception.
Magnets
Earth’s Magnetic Poles Can Trade Places
Your compass points to a spot that keeps wandering. Over long stretches of time, north and south have swapped altogether. Rocks keep the record.