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person that goes to houses and collects information for the census
Another name for 'rational' is "numbers that are equal to the ratio of two whole numbers". Another name for 'irrational' is "numbers that are not equal to the ratio of any two whole numbers".
The numbers are where they are because the person who made the thermometer scale decided which numbers go where.
Real numbers.
There does not appear to be a name for it.
Weird
Quodophile.
Someone who collects everything would be called a hoarder - this type of person may have OCD as well.
Some of the names given for a person who collects trains:model train collectormodel train enthusiasttrain modeler
That's an entomologist.
Gun-collector
usher
The person who studing about the shell is calles as chonchologist.
Arachnid collector or Arachnophile.
simple - eraser collector!
A Pottea.