What does below chemistry rebus means?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

Can you find the 09 errors in the picture below?

What do you answer even though it never asks you questions?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

what does this picture(rebus) riddle means ?

I’m tall when I’m young, and I’m short when I’m old. What am I?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

10+10 and 11+11 can give you the same answer.

Explain how?