Scientists used to say that the wold was flat also.
Not true, the world being flat was much akin to our fairy tales we tell children like the man in the moon or what have you. The world being flat was not a common belief.
Scientists used to say that the wold was flat
This is obviously a typo, it should read...
The wold is fat.
Fatty wolds are a sign of good health.
“Scientists used to say that the wold was flat also.”
Eratosthenes made a very close calculation of the circumference of a round or global Earth over 2,200 years ago. See:
http://www-personal.umich.edu/~copyrght/image/books/Spatial%20Synthesis/Eratosthenes/
It takes some people longer than others to dispense with fantasies and take note of the real world facts.