There were only 10 million people on the planet earth at one time.
Only one million people on the entire planet earth before that.
My mom and dad were born in 1918 and 1920
I was born in 1945
The worlds population has tripled from 2.5 billion people when I was born to 7.5 billion people today.
We have added five billion people to the earth in my lifetime.
Albert Einstein says you got to be good at geometry and math to understand this.