mystery is an interesting topic. I just have an idea how you can write 1 minute speech on this like if you have watched any movie or drama on this topic , you can consider yourself as the main person in the drama who solves the mystery and can write the speech.

Hope it helps !!!!! :)

  • Brainly User
Think about some things which lies as a  mystery .
LIKE- we don't know anything about the life after death.
Mystery thrills. The suspense and mystery hold the persons attention, holds the heart beat, all the concentration and focus of the persons. Many serials on TV, magazines, thriller books, and cinemas do well because of the tense excitement. 
When the mystery is unfolded we relieve ourselves, we feel so happy about it.
We do not yet really know a lot about our Earth and Universe. It is still a mystery to us.
i hope this can help u :]
3 3 3
Example :-

We don't know much about the black hole. A black hole is a place in space where gravity pulls so much that even light can not get out. We can't get any reason for it .

Conclusions :-
Peoples are very fond of thrills and spice so they like mystery stories / films/fiction very much .
Hope my answer helps you buddy! ;)
ur welcm