Who invented the question mark?

谁发明了问号？

There is a question mark over the future of geriatric care.

老年保健医学的未来是一个问号。

There's still a big question mark hanging over his future with the team.

他在队中的前途还是个大问号。

To me it looks like a question mark.

对我来说它就像一个问号。

You're just a walking question mark this morning.

今天早晨你已经问了我一大串问题了。