The German professor has become a legendary type of character, and in fact "Einstein" is a word that does not only sounds like German but also is (Einstein was Suiss, though). If you have never cared for science or were too young to know about the green house effect for instance this is an eldorado for you and your kids.
Deutsches Museum is vast - you must restrain your wanderings especially if you are with children who- and that's this museum's trick - are invited to take part and initiate all kind of experiments. No other museum dares to involve the spectator to that degree - many rooms and cabinets do not function as exhibitis but only by the activism and curiosity of the visitors.
Let your childish willingness to learn be your guide and/or take children with you directly to this place in munich.
Links refering to further information about the German Museum Munich can you find here.