what's the probability of getting a king or a queen from a pack of 52 cards?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What is always in front of you but can’t be seen?

A spaceship was lost. The detective was given a piece of paper. This was the location of the spaceship! This is what the slip had scribbled on it:
Juice, Umbrella, Potato, Ice, Tomato, Elephant, Rice.

Where is the spaceship?

I am the fastest animal but cannot climb the tree. What am I?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?