I saw 'dual' in 'individual' and went down the rabbit hole.

The word 'individual' came to popular use in the 16th century as a description for a single member of a species. It descends from Latin 'in-' meaning 'not; opposite of,' and 'dividuus' meaning 'divisible,' which stems itself from 'dividere' meaning 'divide'.

The word 'divide' comes from Latin 'dividere' which means 'to force apart; cleave; distribute,' assembled by the words 'dis-' meaning 'apart' and '-videre' meaning 'to separate,' which comes from the proto-indo-european root *weidh- 'to separate.'

So, 'individual' literally translates to 'unable to be split apart' as if the individual represented the lowest level of granularity within a group.

I learned something that will probably be important on Jeopardy some day.