the.com/thyroid gland

The butterfly-shaped gland that quietly decides if you're wired or exhausted.

means A small gland in the neck that makes hormones controlling how fast your body burns energy and runs its metabolism.

from From Greek 'thyreoeides,' meaning 'shield-shaped,' built from 'thyreos' (a large oblong door-shield) plus 'eidos' (form, appearance). The name originally described the cartilage of the voice box, which looked like a warrior's shield — the gland simply sits near it and borrowed the name. 'Gland' comes from Latin 'glandula,' a little acorn, since early anatomists thought these lumpy tissues resembled small acorns.

location
Sits at the base of your neck like a bow tie
output
Makes hormones that set your body's idle speed
iodine need
Needs iodine or it swells into a goiter
irony
Controls your metabolism but can't regulate itself without backup
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