They /ð/ is the third-person plural personal pronoun (subjective case) in Modern English. It can also be used with singular meaning, particularly in informal contexts, sometimes to avoid specifying the gender of the person referred to.

https://en.wikipedia.org/wiki/They

"There are all kinds of interesting questions that come from a knowledge of science, which only adds to the excitement and mystery and awe of a flower."
Richard Feynman
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