What does below chemistry rebus means?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Find the 8 in the below-given Image.

You need to arrange three 7 and mathematical symbols to form number 1?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

You are driving down the road in your car on a wild, stormy night, when you pass by a bus stop and you see three people waiting for the bus

An old lady looks as if she is about to die.
An old friend who once saved your life.
The perfect partner you have been dreaming about.
Knowing that there can only be one passenger in your car, whom would you choose?

What does this say?

XLR8

Can you solve the below tricky visual equation?

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?