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1.
Quartz is a birthstone
It's the birthstone for April
2.
California is more populous than New York
California as around 39.03 million people while New York has 19.68 million
3.
The capital of Belize is Belize City
That would be Belmopan
4.
Germanium has an atomic number of 42
It's atomic number is 32
5.
St. Petersburg used to be called Leningrad
6.
Ice cream was first made is Boston
It was made in New York City
7.
1000^999 is greater than 999^1000
8.
There are 13 letters in the Hawaiian alphabet
A, E, H, I, K, L, M, N, O, P, U, W and the ʻokina (')
9.
Despite South Africa having 3 capitals, none of them are the most populous
Johannesburg is the most populous city in South Africa
10.
Aside from Earth, Neptune is the only planet with a name that is greek
That would be Uranus
11.
The first mob added to Minecraft is the Creeper
12.
Monaco has won exactly 1 Eurovision
In 1971 Monaco won a Eurovision with the song Séverine
13.
Canada is larger than Antarctica
Antarctica is 14.2 million square km while Canada is only 9,984,670 square km
14.
a²+b²=c² is a theorem made by Pythagoras
This theorem is called the Pythagorean theorem
15.
The Big Apple is a nickname for New York City