[The Cajun]

The inner core started to solidify more than a billion years ago. It has a radius of about 1,220km, but is growing by about 0.5mm each year.

The entire sentence kind of gave me one of those *Yeah right* moments :)

[Errant]

Yep, lol... Probably some formula based on their billion year start date and taking into consideration the current estimated size, so growth works out to .5mm a year or something along those lines to get to current size. And now it’s scientific fact!