the.com/core

The center that holds everything together, right up until it spectacularly doesn't.

means The central or innermost part of something — the heart of a fruit, a planet, an argument, or a problem — on which the rest depends.

from From the Old French 'cuer,' meaning heart (itself from Latin 'cor,' the root behind 'cordial' and 'courage'). The leap from a beating heart to an apple's middle came through the idea of the vital center — the bit at the very middle that everything else is built around. The connection to Latin 'cor' is widely accepted, though the exact path into English is a little murky.

earth's heart
Inner core is hotter than the sun's surface
solid spin
Inner core may rotate at its own speed
apple truth
The core is just seeds plotting a forest
reactor dread
A meltdown means the core literally melts itself
word root
Likely from Latin cor, meaning heart
for instance

earth's core — iron-nickel center at 5,200°c, 3,480 km below surface

apple core — central seed chamber in apples, contains cyanogenic compounds

core memory — 1950s-1970s computer memory using magnetic ferrite rings

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