[Rodm]

'Reversals happen every 250,000 years or so, and as there has not been one for almost a million years, we are due one soon.'


Really,Reversals happen every 250K years but it has not happen in the last million. Boy that makes sense.

[Amelia]

Really,Reversals happen every 250K years but it has not happen in the last million. Boy that makes sense.

That's what I was thinking...we must be about 750,000 years overdue for one...

[mrb1960]

Ya know what gets me,,,,,,,,

How the hell do they know it switches every 250,000 years????

[Dan Day]

"Reversals happen every 250,000 years or so, and as there has not been one for almost a million years, we are due one soon."

Really,Reversals happen every 250K years but it has not happen in the last million. Boy that makes sense.

Read it again. The "or so" indicates that they mean "on average", not that it happens each 250k years like clockwork.

[docbnj]

Reversals do not happen on any regular schedule, but at widely varying intervals.

We have no idea how long it takes for a reversal to happens, but 1000 years would be a reasonable guess, with a huge error factor.