There are some categories broken up so small that single questions fit multiple tiny categories.
Examples:
What is the traditional color of a Chinese bride's wedding dress?
A major difference between the societies of the United States and Japan is the presence in the United States of a higher degree of ?
This is part of the game. Sometimes it is not easy to find the category the other players will think of.
However the first one should go to „fashion, clothing” category (thank you for finding it was lost in translation). The other may go to Earth in general – I can't find better choice.
How many people have to categorize each question?
Only 10 of the same choice. This way there are no ties.
Does each world have their own database, or are they all together?
They are all together.
Once enough people have categorized a given question, what happens to the next person who categorizes that question?
When there are enough votes, the question is closed, no more changes. However if someone finds the „good” category until the end of day he or she still get s the reward. If a question is closed, after a day you cannot classify it anymore.
Also, it seems to me that Modern History and 20th and 21st century (both under History) are redundant. If Modern means anything between Middle Ages and 20th century, it should be clarified.
There is a small blue question mark above the categorization tool. You can find some comments and helpful hints there about the eras and some other categories.
Are the categories actually going to be used of anything?
When the categorization is ready, you can play quiz with the questions in the database – according to categories.
Also could maybe use Psychology as a sub-category for some of these questions?
There is no such category, I would use biology/medical science, even if it is not exact.
For a question like this:
Master of Puppets is an album/song title for which band?
Guns N' Roses
Metallica
Meat Loaf
Slayer
Do I categorize it as a question about musical artists?
Yes.
Also, I'm having trouble categorizing questions about nations in specific eg.
Serbia's national drink is
The colour of the german flag is
Could we add a sub-category 'Nations' under the geography/astronomy/geology category?
Sorry, there are no more sub categories. However the first should go into „Food and drinks”, the second (because of no better choice) to „Geography/Europe”.
So when will we receive the SE reward?
There are more than 25 thousand questions in the database, so be patient. If you are lucky, you can get some reward every day, but if unlucky, you must wait quite a lot before getting anything, but then you may get a bigger amount.