This year the world’s population will reach 7 billion people [1]. When I was born, I was the 2,703,497,532nd person alive on the Earth. The World population reached 1 billion people in about 1850; 2 billion in about 1930; 3 billion in 1960; 4 billion in 1974, 5 billion in 1987; 6 billion in 1999. My Dad is in the 1 Billion Club; my children are in the 4 billion club.
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