Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

There are forty elephants and they have forty-fore heads. How can this be possible?

A man dies of old age on his 25 birthday. How is this possible?

Decode below rebus
D
N
A
T
S , D

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What work can one never finish?