What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

What goes up but never comes down?

How many bananas can you eat if your stomach is empty?

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

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?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

why number 8549176320 is one of a kind?

I make two people out of one. What am I?

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?

I travel all around the world but always stay in the corner. What am I?