There is something which is always coming but never arrives?

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?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

What four weights can be used to balance from 1 to 30 pounds?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Rearrange the letters in "new door" to make one word.

How many times can you subtract the number two from the number fifty?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

What is the fastest way to double your money?