What is the shape of the Earth?

Sherlock Holmes once said, when Dr. Watson enlightened him about the fact that the Earth is round: "Excellent. I didn't know that, and now I will try to forget it as soon as possible."
Dr. Watson: - ????
S. Holmes: - This knowledge will NOT help me in my work.

I completely agree. )))) (Although, I can't forget what I learned in school yet).