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 Fotocredit: PantherMedia / Alexander Raths

Biology

Exactly. Biology is the most popular science subject among women. 

It is not always just scientists who invent things, however. In 1908, it was a Dresden housewife and mother who made a useful discovery. Today, a company with 3,300 employees bears her name. 

What did Melitta Bentz invent in 1908, using her sons' blotting paper?

The bookmark  The coffee filter  The printing press

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