Nits are lice eggs. They are hard to see and are often
confused with dandruff or hair spray droplets. Nits are found firmly
attached to the hair shaft. They are oval and usually yellow to
white. Nits take about a week to hatch. All nits must be removed to
prevent reinfestation with lice. They can be removed with a special
comb or with the fingers. Topical preparations are available that
loosen the "glue" that binds them to the hair, making removal easier.
Incidentally, the term "nit-picking" -- meaning "too
much minor,
overly particular criticism" -- is relatively recent; it dates only
to the 1960s. Nit-picking is in the realm of hairsplitting.
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