In winter time the windows are dew children like to put their hands on it or make some drawing on it.
When you have small kids in the house, after they have eaten the parent have to wash or dry their hands otherwise you have their fingerprint all over.
In some country they will cheek your fingerprint when you enter the country for security.
When we have a lot of glass or mirror in the house usually they are fill with fingerprint.
Some Chinese have small hands with long finger.
We use our hands for many different things as witting, playing, hugging, etc. it will be really hard if we don´t have them.
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