What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

Can you find the missing piece of the Porsche?

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

Why 1729 is a magic number? Answer Logically.

What number should come in place of the question mark below?

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

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

It was a dark stormy night and a couple were in a car driving madly to a city. The car broke down and the husband had to go get help from someone who spoke his language. He was afraid to leave his wife alone in the car so he locked the car before leaving. When he came back, the car was in the same state as he had left it but his wife was dead, there was blood on the floor and there was a stranger in the car. What happened?