What goes up but never comes down?

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?

How can you take 2 from 5 and leave 4?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

The centre of the third figure is empty. What digit should fit inside?

Five teams were competing in cricket where they faced each other exactly once. After the tournament, the following is the point table.

DareDevils 6
SuperKings 5
Royals 4
Sunrisers 2
Riders ?

How many points did Riders end up with?

Name a key which is hardest to turn.

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

It is always ahead of me yet I can never see it. What is it?