What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

A wealthy man lives alone in a small cottage. Being partially handicapped he had everything delivered to his cottage. The mailman was delivering a letter one Thursday when he noticed that the front door was ajar. Through the opening he could see the man's body lying in a pool of dried blood. When a police officer arrived he surveyed the scene. On the porch were two bottles of warm milk, Monday's newspaper, a catalog, flyers, and unopened mail. The police officer suspects it was foul play. Who does he suspect and why?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

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

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

When it is alive we sing, when it is dead we clap our hands. What is it?

What happened when the wheel was invented?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?