what does the below rebus means?

What breaks yet never falls, and what falls yet never breaks?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

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

What has 13 hearts but no other organs?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

People put me on the table and cut me but do not eat me. What am I?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?