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
flagPakistan
90%
9%
0%
0%
11
flagAustria
72%
18%
9%
0%
11
flagAustralia
61%
30%
0%
7%
13
flagGreece
50%
40%
0%
10%
10
flagIndia
36%
27%
13%
22%
22
flagthe United States
28%
28%
16%
28%
25
flagGermany
27%
34%
6%
31%
29
flagPoland
24%
19%
24%
30%
1419
flagthe United Kingdom
9%
23%
42%
23%
21