What brings you down but never up?

What Does this text mean:

important=important

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

What is the centre of gravity?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?