I didn't. I read it on the internet along with many other interesting things I didn't know about cats, such as:
"In just seven years, a single pair of cats and their offspring could produce a staggering total of 420,000 kittens."
"Approximately 24 cat skins can make a coat."
"In 1888, more than 300,000 mummified cats were found an Egyptian cemetery. They were stripped of their wrappings and carted off to be used by farmers in England and the U.S. for fertilizer."
I read them here (99 interesting facts about cats):