The Earth could be about to turn upside down. The planet's magnetic field is showing signs of wanting to make a gigantic somersault, so that magnetic north heads towards Antarctica, and magnetic south goes north. Compasses will point the wrong way, and migrating birds, fish and turtles are going to be very confused.
Some experts have stuck their necks out to predict that we can expect the next reversal some time in the next 2,000 years. The process would probably then take anything between 100 and a few thousand years - not even a blink in the history of Earth. We can only guess what life would be like during that reversal. Anyone trying to navigate with a magnetic compass is going to have a tough time, but what is going to happen to all those birds, fish and other animals that migrate vast distances using their own internal magnetic compass? Will they have time to re-draw their magnetic maps and get new bearings?
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