What is deltiology?

Hobby of collecting postcards
Science of quantum equations
Science of wines
Field of medicine, about intestines
Officially the biggest collection postcards has got Mario Morby from Great Britain. Contains 1 000 265 pieces. It is officially record in Guinness Book of Records.
lukasz Poland
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Very interesting!
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Answers by country

Hobby of collecting postcards
Science of quantum equations
Science of wines
Field of medicine, about intestines
answers
flagAustralia
58%
33%
0%
8%
12
flagIndia
50%
18%
12%
18%
16
flagthe United States
28%
28%
16%
28%
25
flagGermany
25%
37%
6%
31%
16
flagPoland
22%
19%
25%
31%
1230
flagthe United Kingdom
9%
23%
42%
23%
21